integer overflow warning

CoverityScan detected an integer overflow in logger.c

731 if (configpv.verbose)
732 printf("%s", final_buf);
733 else

CID undefined (#4 of 4): Integer overflowed argument (INTEGER_OVERFLOW)
45. overflow_sink: Overflowed or truncated value (or a value computed from an overflowed or truncated value) sz + 1 used as critical argument to function.

734 accumulate_flush_record(final_buf, sz+1);