xwayland: zalloc the x11_data_sources

The wrapped weston_data_source struct has new fields which were left
uninitialized, so its access is unreliable.

The data source in xwayland/dnd.c should be eventually setting the
drag-and-drop actions, but it is a lot more incomplete than that
(read: completely), so falls out of the scope of this patch.

Signed-off-by: Carlos Garnacho <carlosg@gnome.org>

xwayland/dnd.c

@@ -162,7 +162,7 @@ handle_enter(struct weston_wm *wm, xcb_client_message_event_t *client_message)
 	xcb_get_property_cookie_t cookie;
 	xcb_get_property_reply_t *reply;
 
-	source = malloc(sizeof *source);
+	source = zalloc(sizeof *source);
 	if (source == NULL)
 		return;
 

xwayland/selection.c

@@ -197,7 +197,7 @@ weston_wm_get_selection_targets(struct weston_wm *wm)
 		return;
 	}
 
-	source = malloc(sizeof *source);
+	source = zalloc(sizeof *source);
 	if (source == NULL) {
 		free(reply);
 		return;