fix: correct struct init + one array to array comp.

[lemire]

Mostly nitpicking but one change is significant...

This expression looks wrong...

context->high_bytes != high48

I am not sure what an array-to-array comparison does in C.

[SLieve]

Thanks for finding that bug @lemire !

[madscientist]

If you used the preprocessor to handle zero-initialization I think something like this would be nicer:

#if ...whatever for C++ and C23...
# define EMPTY_INIT
#else
# define EMPTY_INIT 0
#endif 

roaring_bulk_context_t context = {EMPTY_INIT};

rather than putting the braces in the preproc. Just a suggestion.

[lemire]

@madscientist I am going to merge what I have now but I am inviting contributions to improve it.