fix some warnings from GCC -Wextra

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53599 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/valgen.cpp

@@ -370,7 +370,8 @@ bool wxGenericValidator::TransferToWindow(void)
         }
     } else
 #endif
-        ;   // to match the last 'else' above
+    {   // to match the last 'else' above
+    }
 
   // unrecognized control, or bad pointer
   return false;