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/osx/core/printmac.cpp

@@ -718,8 +718,7 @@ bool wxMacPrinter::Print(wxWindow *parent, wxPrintout *printout, bool prompt)
     if (sm_abortWindow)
     {
         sm_abortWindow->Show(false);
-        delete sm_abortWindow;
-        sm_abortWindow = NULL;
+        wxDELETE(sm_abortWindow);
     }
 
     wxEndBusyCursor();