Fix for uninitialized pointer access from wxPrintData's copy ctor

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30510 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/cmndata.cpp

@@ -190,6 +190,7 @@ wxPrintData::wxPrintData()
 wxPrintData::wxPrintData(const wxPrintData& printData)
     : wxObject()
 {
+    m_nativeData = NULL;
     (*this) = printData;
 }
 
@@ -238,9 +239,12 @@ void wxPrintData::operator=(const wxPrintData& data)
     m_filename = data.m_filename;   
 
     // UnRef old m_nativeData   
+    if (m_nativeData)
+    {
         m_nativeData->m_ref--;
         if (m_nativeData->m_ref == 0) 
             delete m_nativeData;
+    }
     // Set Ref new one
     m_nativeData = data.GetNativeData();
     m_nativeData->m_ref++;