getopt: fix null pointer arithmetic ub

[musl] / src / thread / pthread_getschedparam.c

#include "pthread_impl.h"
#include "lock.h"

int pthread_getschedparam(pthread_t t, int *restrict policy, struct sched_param *restrict param)
{
        int r;
        sigset_t set;
        __block_app_sigs(&set);
        LOCK(t->killlock);
        if (!t->tid) {
                r = ESRCH;
        } else {
                r = -__syscall(SYS_sched_getparam, t->tid, param);
                if (!r) {
                        *policy = __syscall(SYS_sched_getscheduler, t->tid);
                }
        }
        UNLOCK(t->killlock);
        __restore_sigs(&set);
        return r;
}