FakeVim: Initialize pointer

Change-Id: Icfb7f733f41593aef09c71d5f8f13f8c453c7cd6
Reviewed-by: hjk <hjk@qt.io>

src/plugins/fakevim/fakevimplugin.cpp

@@ -908,7 +908,7 @@ public:
     }
 
 private:
-    FakeVimHandler *m_handler;
+    FakeVimHandler *m_handler = nullptr;
     QString m_needle;
 };