corrected warnings when compiling with -Wall -W

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15412 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/valgen.cpp

@@ -81,6 +81,7 @@ wxGenericValidator::wxGenericValidator(wxArrayInt *val)
 }
 
 wxGenericValidator::wxGenericValidator(const wxGenericValidator& val)
+    : wxValidator()
 {
     Copy(val);
 }