fix failure of pthread_setschedparam to pass correct param to kernel

[musl] / src / thread / pthread_setschedparam.c

#include "pthread_impl.h"

int pthread_setschedparam(pthread_t t, int policy, const struct sched_param *param)
{
        int r;
        __lock(t->killlock);
        r = t->dead ? ESRCH : -__syscall(SYS_sched_setscheduler, t->tid, policy, param);
        __unlock(t->killlock);
        return r;
}