Fix struct/class mis-match

Change-Id: Ia979525691781a08503ba91df42db12db6408e89
Reviewed-by: Michal Klocek <michal.klocek@qt.io>

src/imports/location/qdeclarativegeomapitemview_p.h

@@ -139,7 +139,7 @@ private:
     int m_readyIncubators;
     bool m_repopulating;
 
-    friend class QDeclarativeGeoMapItemViewItemData;
+    friend struct QDeclarativeGeoMapItemViewItemData;
     friend class MapItemViewDelegateIncubator;
 };