fix some 'might not be initialized in this function' warnings

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32305 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/regex/regc_color.c

@@ -446,11 +446,11 @@ struct state *rp;
 	int shift;
 	int level;
 	int i;
-	int b;
+	int b = 0;
 	union tree *t;
 	union tree *cb;
 	union tree *fillt;
-	union tree *lastt;
+	union tree *lastt = NULL;
 	int previ;
 	int ndone;
 	color co;