Zero padding bytes in DndReceiverProp struct.

This removes valgrind's complains about accessing uninitialized memory.

Signed-off-by: Alexander Golubev <fatzer2@gmail.com>

src/kernel/qmotifdnd_x11.cpp

@@ -387,7 +387,7 @@ static void DndReadSourceProperty(Display * dpy,
 static void DndWriteReceiverProperty(Display * dpy, Window window,
 				     unsigned char protocol_style)
 {
-    DndReceiverProp receiver_prop ;
+    DndReceiverProp receiver_prop = {};
 
     receiver_prop.byte_order = DndByteOrder() ;
     receiver_prop.protocol_version = DND_PROTOCOL_VERSION;