Clang Warnings

```
kilo.c:71:8: warning: padding size of 'struct editorSyntax' with 4 bytes to alignment boundary [-Wpadded]
struct editorSyntax {
^
kilo.c:106:11: warning: padding struct 'struct editorConfig' with 4 bytes to align 'filename' [-Wpadded]
char *filename; /* Currently open filename */

kilo.c:85:11: warning: padding struct 'struct erow' with 4 bytes to align 'chars' [-Wpadded]
char *chars; /* Row content. */
^
kilo.c:81:16: warning: padding size of 'struct erow' with 4 bytes to alignment boundary [-Wpadded]
typedef struct erow {

kilo.c:229:20: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kilo.c:231:20: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
raw.c_oflag &= ~(OPOST);

kilo.c:256:21: warning: implicit conversion loses integer precision: 'ssize_t' (aka 'long') to 'int' [-Wshorten-64-to-32]
while ((nread = read(fd,&c,1)) == 0);

kilo.c:383:36: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
row->hl = realloc(row->hl,row->rsize);
~~~~~~~ ~~~~~^~~~~
kilo.c:485:28: warning: implicit conversion loses integer precision: 'unsigned long' to 'int' [-Wshorten-64-to-32]
int klen = strlen(keywords[j]);

kilo.c:489:43: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
if (!memcmp(p,keywords[j],klen) &&

kilo.c:541:26: warning: implicit conversion loses integer precision: 'unsigned long' to 'int' [-Wshorten-64-to-32]
int patlen = strlen(s->filematch[i]);
~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~
kilo.c:573:31: warning: implicit conversion changes signedness: 'int' to 'unsigned int' [-Wsign-conversion]
row->render = malloc(row->size + tabs*8 + nonprint*9 + 1);

kilo.c:594:50: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
E.row = realloc(E.row,sizeof(erow)*(E.numrows+1));
~ ~~~~~~~~~^~
kilo.c:596:64: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
memmove(E.row+at+1,E.row+at,sizeof(E.row[0])*(E.numrows-at));

kilo.c:599:22: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
E.row[at].size = len;

kilo.c:627:63: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
memmove(E.row+at,E.row+at+1,sizeof(E.row[0])*(E.numrows-at-1));

kilo.c:648:22: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
p = buf = malloc(totlen);

kilo.c:667:57: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
row->chars = realloc(row->chars,row->size+padlen+2);
~~~~~~~ ~~~~~~~~~~~~~~~~^~
kilo.c:674:50: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
row->chars = realloc(row->chars,row->size+2);
~~~~~~~ ~~~~~~~~~^~
kilo.c:678:22: warning: implicit conversion loses integer precision: 'int' to 'char' [-Wimplicit-int-conversion]
row->chars[at] = c;

kilo.c:685:42: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
row->chars = realloc(row->chars,row->size+len+1);

kilo.c:744:63: warning: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned long') [-Wsign-conversion]
editorInsertRow(filerow+1,row->chars+filecol,row->size-filecol);

kilo.c:771:65: warning: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned long') [-Wsign-conversion]
editorRowAppendString(&E.row[filerow-1],row->chars,row->size);

kilo.c:821:40: warning: implicit conversion changes signedness: 'ssize_t' (aka 'long') to 'size_t' (aka 'unsigned long') [-Wsign-conversion]
editorInsertRow(E.numrows,line,linelen);
~~~~~~~~~~~~~~~ ^~~~~~~
kilo.c:839:22: warning: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned long') [-Wsign-conversion]
if (write(fd,buf,len) != len) goto writeerr;
~~~~~ ^~~
kilo.c:868:38: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
char *new = realloc(ab->b,ab->len+len);
~~~~~~~ ~~~~~~~^~~~
kilo.c:860:8: warning: padding size of 'struct abuf' with 4 bytes to alignment boundary [-Wpadded]
struct abuf {
^
kilo.c:939:30: warning: declaration shadows a local variable [-Wshadow]
char buf[16];
^
kilo.c:885:10: note: previous declaration is here
char buf[32];
^
kilo.c:996:33: warning: implicit conversion changes signedness: 'int' to 'size_t' (aka 'unsigned long') [-Wsign-conversion]
write(STDOUT_FILENO,ab.b,ab.len);
~~~~~ ~~~^~~
kilo.c:976:18: warning: implicit conversion loses integer precision: 'unsigned long' to 'int' [-Wshorten-64-to-32]
int msglen = strlen(E.statusmsg);
~~~~~~ ^~~~~~~~~~~~~~~~~~~
kilo.c:994:22: warning: implicit conversion loses integer precision: 'unsigned long' to 'int' [-Wshorten-64-to-32]
abAppend(&ab,buf,strlen(buf));
~~~~~~~~ ^~~~~~~~~~~
kilo.c:1005:47: warning: format string is not a string literal [-Wformat-nonliteral]
vsnprintf(E.statusmsg,sizeof(E.statusmsg),fmt,ap);
^~~
kilo.c:1057:33: warning: implicit conversion loses integer precision: 'int' to 'char' [-Wimplicit-int-conversion]
query[qlen++] = c;
~ ^
kilo.c:1090:44: warning: implicit conversion changes signedness: 'int' to 'unsigned long' [-Wsign-conversion]
saved_hl = malloc(row->rsize);
~~~~~~ ~~~~~^~~~~
kilo.c:1076:41: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
match_offset = match-E.row[current].render;
~ ~~~~~^~~~~~~~~~~~~~~~~~~~~~
kilo.c:1211:9: warning: 'break' will never be executed [-Wunreachable-code-break]
break;
kilo.c:1307:12: warning: 'return' will never be executed [-Wunreachable-code-return]
return 0;
```