Fixed 1 out of 210 warnings. ;-)

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%402696

src/video/quartz/SDL_QuartzEvents.m

@@ -254,7 +254,7 @@ void     QZ_InitOSKeymap (_THIS) {
 
 static void QZ_DoKey (_THIS, int state, NSEvent *event) {
 
-    NSString *chars;
+    NSString *chars = NULL;
     unsigned int i, numChars;
     SDL_keysym key;