output/MultipleOutputs: move code to AudioOutput::EnableDisableWait()

src/output/Internal.hxx

@@ -335,6 +335,23 @@ public:
 	 */
 	void DisableWait();
 
+	/**
+	 * Attempt to enable or disable the device as specified by the
+	 * #enabled attribute; attempt to sync it with #really_enabled
+	 * (wrapper for EnableWait() or DisableWait()).
+	 *
+	 * Caller must lock the mutex.
+	 */
+	void EnableDisableWait() {
+		if (enabled == really_enabled)
+			return;
+
+		if (enabled)
+			EnableWait();
+		else
+			DisableWait();
+	}
+
 	void LockPauseAsync();
 
 	/**

src/output/MultipleOutputs.cxx

@@ -112,13 +112,7 @@ MultipleOutputs::EnableDisable()
 {
 	for (auto ao : outputs) {
 		const ScopeLock lock(ao->mutex);
-
+		ao->EnableDisableWait();
-		if (ao->enabled != ao->really_enabled) {
-			if (ao->enabled)
-				ao->EnableWait();
-			else
-				ao->DisableWait();
-		}
 	}
 }