fix app exit code: it is returned by OnExit(), not OnRun()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17688 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/app.cpp

@@ -712,7 +712,7 @@ int wxEntry(WXHINSTANCE hInstance,
             if ( enterLoop )
             {
                 // run the main loop
-                retValue = wxTheApp->OnRun();
+                wxTheApp->OnRun();
             }
             else
             {
@@ -739,7 +739,7 @@ int wxEntry(WXHINSTANCE hInstance,
             }
         }
 
-        wxTheApp->OnExit();
+        retValue = wxTheApp->OnExit();
 
         wxEntryCleanup();