MINOR: task: limit the remote thread wakeup to the global runqueue only

The test in __task_wakeup() to figure if the remote threads are sleeping
doesn't make sense outside of the global runqueue test, since there are
only two possibilities here: local runqueue or global runqueue, hence a
sleeping thread is another one and can only happen when sending to the
global run queue. Let's move the test inside the "if" block.

src/task.c

@@ -153,7 +153,6 @@ void __task_wakeup(struct task *t)
 	if (root == &rqueue) {
 		_HA_ATOMIC_OR(&t->state, TASK_GLOBAL);
 		HA_SPIN_UNLOCK(TASK_RQ_LOCK, &rq_lock);
-	}
 
 		/* If all threads that are supposed to handle this task are sleeping,
 		 * wake one.
@@ -166,6 +165,7 @@ void __task_wakeup(struct task *t)
 			_HA_ATOMIC_AND(&sleeping_thread_mask, ~m);
 			wake_thread(my_ffsl(m) - 1);
 		}
+	}
 #endif
 	return;
 }