fix scanf handling of "0" (followed by immediate EOF) with "%x"

[musl] / src / stdio / rewind.c

#include "stdio_impl.h"

void rewind(FILE *f)
{
        FLOCK(f);
        __fseeko_unlocked(f, 0, SEEK_SET);
        f->flags &= ~F_ERR;
        FUNLOCK(f);
}