Return EALREADY if already in requested playback mode.

That's what the BeBook says the method is suppose to do.

src/kits/game/FileGameSound.cpp

@@ -331,7 +331,9 @@ BFileGameSound::Perform(int32 selector,
 status_t
 BFileGameSound::SetPaused(bool isPaused, bigtime_t rampTime)
 {
-	if (fPaused != isPaused) {
+	if (fPaused == isPaused)
+		return EALREADY;
+
 	Lock();
 
 	// Clear any old ramping
@@ -350,7 +352,6 @@ BFileGameSound::SetPaused(bool isPaused, bigtime_t rampTime)
 
 	fPaused = isPaused;
 	Unlock();
-	}
 
 	return B_OK;
 }