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/src/clipboard.c b/src/clipboard.c
index 54f06e6..5a3a02d 100644
--- a/src/clipboard.c
+++ b/src/clipboard.c
@@ -283,10 +283,9 @@
 {
 	struct clipboard *clipboard;
 
-	clipboard = malloc(sizeof *clipboard);
+	clipboard = zalloc(sizeof *clipboard);
 	if (clipboard == NULL)
 		return NULL;
-	memset(clipboard, 0, sizeof *clipboard);
 
 	clipboard->seat = seat;
 	clipboard->selection_listener.notify = clipboard_set_selection;