use a more-correct integer type, and silence 64-bit warnings as a bonus

[musl] / src / errno / __errno_location.c

#include <errno.h>
#include "libc.h"

#undef errno
int errno;

int *__errno_location(void)
{
        if (libc.errno_location) return libc.errno_location();
        return &errno;
}