Another forgotten variable declaration

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401074

src/video/gem/SDL_gemevents.c

@@ -138,7 +138,7 @@ void GEM_PumpEvents(_THIS)
 	
 	for (;;)
 	{
-		int quit, resultat;
+		int quit, resultat, event_mask;
 		short buffer[8], kc;
 		short x2,y2,w2,h2;