Move static into the getter function

Change-Id: I6a4ed20cc8f208fa59f12d65d3ff8287726db594
Reviewed-on: https://gerrit.libreoffice.org/75939
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

cui/source/factory/cuiexp.cxx

@@ -57,11 +57,9 @@
 
 namespace cui
 {
-    static AbstractDialogFactory_Impl* pFactory=nullptr;
     static AbstractDialogFactory_Impl* GetFactory()
     {
-        if ( !pFactory )
-            pFactory = new AbstractDialogFactory_Impl;
+        static AbstractDialogFactory_Impl* pFactory = new AbstractDialogFactory_Impl;
         return pFactory;
     }
 }