[riot-notifications] [RIOT-OS/RIOT] core/mutex: Cleanup (#15327)

[Marian Buschsieweke]

@maribu commented on this pull request.



> -            mutex->queue.next->next = NULL;
-        }
-        else {
-            thread_add_to_list(&mutex->queue, me);
-        }
-        irq_restore(irqstate);
-        thread_yield_higher();
-        /* We were woken up by scheduler. Waker removed us from queue.
-         * We have the mutex now. */
-        return 1;
+
+    thread_t *me = thread_get_active();
+    DEBUG("PID[%" PRIkernel_pid "]: Adding node to mutex queue: prio: %"
+          PRIu32 "\n", thread_getpid(), (uint32_t)me->priority);
+    sched_set_status(me, STATUS_MUTEX_BLOCKED);
+    if (mutex->queue.next == MUTEX_LOCKED) {

[pong](https://github.com/RIOT-OS/RIOT/pull/15398)!

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