corrected warnings when compiling with -Wall -W

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15351 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/matrix.cpp

@@ -39,6 +39,7 @@ wxTransformMatrix::wxTransformMatrix(void)
 }
 
 wxTransformMatrix::wxTransformMatrix(const wxTransformMatrix& mat)
+    : wxObject()
 {
     (*this) = mat;
 }