Fix warning about use of uninitialized values

Clang complains that these values may be used uninitialized if both
conditions are false. This can actually not happen, so just initialize
them to 0 to quiten up the compiler.

Change-Id: I32530b974058e3484b5e7005717b7cd389cf7305
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/watchhandler.cpp

@@ -1688,7 +1688,7 @@ void WatchHandler::showEditValue(const WatchData &data)
             showSeparateWidget(l);
             m_model->m_editHandlers[key] = l;
         }
-        int width, height, format;
+        int width = 0, height = 0, format = 0;
         QByteArray ba;
         uchar *bits = 0;
         if (data.editformat == DisplayImageData) {