fix stale locks left behind when pthread_create fails

[musl] / src / thread / pthread_mutexattr_settype.c

#include "pthread_impl.h"

int pthread_mutexattr_settype(pthread_mutexattr_t *a, int type)
{
        if ((unsigned)type > 2) return EINVAL;
        *a = (*a & ~3) | type;
        return 0;
}