[musl] realloci(): A realloc() variant that works in-place

[Collin Funk]

"A. Wilcox" <AWilcox@Wilcox-Tech.com> writes:

>> -  We could perfectly return int (0 for success, -1 for error),
>>   but returning the pointer makes it a drop-in replacement for
>>   realloc(3), and also allows using it in chained code
>> 
>> foo(realloci(p, size));
>
>
> This is never safe if `realloci` can return `NULL`, IMO.

This was my concern as well. The code looks nicer than a normal realloc,
but I think it will lead to more people not checking for allocation
failures. I would rather have a nice error message than a segmentation
fault when a program fails to allocate memory.

Collin