Fix MSVC's class/vs struct warning.

Change-Id: I5839f979b6fc8687b55dc46917dfc72abd3122a9
Reviewed-on: http://codereview.qt.nokia.com/2913


Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

src/plugins/git/gitsubmiteditor.h

@@ -45,7 +45,7 @@ namespace Git {
 namespace Internal {
 
 class GitSubmitEditorWidget;
-struct CommitData;
+class CommitData;
 struct GitSubmitEditorPanelData;
 
 class GitSubmitEditor : public VCSBase::VCSBaseSubmitEditor