adding wxFALLTHROUGH where until now we had comments, allows for code-analysis support

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76399 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/regex.cpp

@@ -433,7 +433,7 @@ bool wxRegExImpl::Matches(const wxRegChar *str,
             // an error occurred
             wxLogError(_("Failed to find match for regular expression: %s"),
                        GetErrorMsg(rc, !str).c_str());
-            // fall through
+            wxFALLTHROUGH;
 
         case REG_NOMATCH:
             // no match