malloc + memset -> zalloc

And for clients using the xmalloc helper, use xzalloc.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
diff --git a/clients/dnd.c b/clients/dnd.c
index ff46fd7..cfdf92f 100644
--- a/clients/dnd.c
+++ b/clients/dnd.c
@@ -567,9 +567,7 @@
 	int32_t width, height;
 	unsigned int i;
 
-	dnd = xmalloc(sizeof *dnd);
-	memset(dnd, 0, sizeof *dnd);
-
+	dnd = xzalloc(sizeof *dnd);
 	dnd->window = window_create(display);
 	dnd->widget = frame_create(dnd->window, dnd);
 	window_set_title(dnd->window, "Wayland Drag and Drop Demo");