fix wrong return value from wmemmove on forward copies

[musl] / src / string / strtok_r.c

#include <string.h>

char *strtok_r(char *restrict s, const char *restrict sep, char **restrict p)
{
        if (!s && !(s = *p)) return NULL;
        s += strspn(s, sep);
        if (!*s) return *p = 0;
        *p = s + strcspn(s, sep);
        if (**p) *(*p)++ = 0;
        else *p = 0;
        return s;
}