Put "#if wxUSE_TOOLBAR" around a variable only used in this case.

No real changes.

Closes #14957.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73397 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/propgrid/manager.cpp

@@ -745,12 +745,14 @@ bool wxPropertyGridManager::DoSelectPage( int index )
             return false;
     }
 
+#if wxUSE_TOOLBAR
     wxPropertyGridPage* prevPage;
 
     if ( m_selPage >= 0 )
         prevPage = GetPage(m_selPage);
     else
         prevPage = m_emptyPage;
+#endif
 
     wxPropertyGridPage* nextPage;