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/nested.c b/clients/nested.c
index ced0b98..aa4bf34 100644
--- a/clients/nested.c
+++ b/clients/nested.c
@@ -404,13 +404,12 @@
 	struct nested *nested = wl_resource_get_user_data(resource);
 	struct nested_surface *surface;
 	
-	surface = malloc(sizeof *surface);
+	surface = zalloc(sizeof *surface);
 	if (surface == NULL) {
 		wl_resource_post_no_memory(resource);
 		return;
 	}
 
-	memset(surface, 0, sizeof *surface);
 	surface->nested = nested;
 
 	display_acquire_window_surface(nested->display,
@@ -568,10 +567,9 @@
 {
 	struct nested *nested;
 
-	nested = malloc(sizeof *nested);
+	nested = zalloc(sizeof *nested);
 	if (nested == NULL)
 		return nested;
-	memset(nested, 0, sizeof *nested);
 
 	nested->window = window_create(display);
 	nested->widget = frame_create(nested->window, nested);