Potential undefined behavior when negating value in sdsll2str
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Descripción
When compiling with [UndefinedBehaviorSanitizer](https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html) and running the tests (`CC=clang-6.0 CFLAGS='-fsanitize=undefined'`, the following error is raised:
```
[...]
6 - sdscatprintf() seems working in the base case: PASSED
sds.c:446:23: runtime error: negation of -9223372036854775808 cannot be represented
in type 'long long'; cast to an unsigned type to negate this value to itself
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior sds.c:446:23 in
[...]
```
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