Fix 'uninitialized value used' warnings

src/eventthread.cpp

@@ -85,6 +85,7 @@ void EventThread::process(RGSSThreadData &rtData)
 	int toggleFSMod = rtData.config.anyAltToggleFS ? KMOD_ALT : KMOD_LALT;
 
 	fps.lastFrame = SDL_GetPerformanceCounter();
+	fps.displayCounter = 0;
 	fps.displaying = false;
 	fps.immInitFlag = false;
 	fps.immFiniFlag = false;

src/sprite.cpp

@@ -114,6 +114,7 @@ struct SpritePrivate
 		wave.length = 180;
 		wave.speed = 360;
 		wave.phase = 0.0;
+		wave.dirty = false;
 #endif
 	}