2.5 - Warning cleanups (for mingw+scons)

Also, made the Outliner's horizontal scrollbar work better for keymaps view. It's still using an approximation of the width, but at least you can scroll now.

source/blender/editors/space_sequencer/sequencer_add.c

@@ -291,7 +291,7 @@ static int sequencer_add_movie_strip_exec(bContext *C, wmOperator *op)
 	struct anim *an;
 	char filename[FILE_MAX];
 
-	Sequence *seq, *soundseq;	/* generic strip vars */
+	Sequence *seq, *soundseq=NULL;	/* generic strip vars */
 	Strip *strip;
 	StripElem *se;