Use wxDELETE() and wxDELETEA() when possible.

Use wxDELETE[A]() functions which automatically NULL out their arguments after
deleting them instead of doing it manually.

Closes #9685.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64656 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/paper.cpp

@@ -374,8 +374,7 @@ bool wxPrintPaperModule::OnInit()
 
 void wxPrintPaperModule::OnExit()
 {
-    delete wxThePrintPaperDatabase;
-    wxThePrintPaperDatabase = NULL;
+    wxDELETE(wxThePrintPaperDatabase);
 }
 
 #endif // wxUSE_PRINTING_ARCHITECTURE