coverity#1351757 Uninitialized pointer field

Change-Id: I996dc17ba0c01bf23283687dffb563b0eac3a31a

libreofficekit/qa/gtktiledviewer/gtktiledviewer.cxx

@@ -140,6 +140,11 @@ public:
         m_pProgressBar(nullptr),
         m_pStatusbarLabel(nullptr),
         m_pZoomLabel(nullptr),
+        m_pSaveButton(nullptr),
+        m_pCopyButton(nullptr),
+        m_pPasteButton(nullptr),
+        m_pUndo(nullptr),
+        m_pRedo(nullptr),
         m_pEnableEditing(nullptr),
         m_pBold(nullptr),
         m_pItalic(nullptr),