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/screenshooter.c b/src/screenshooter.c
index 2b37071..2414015 100644
--- a/src/screenshooter.c
+++ b/src/screenshooter.c
@@ -465,12 +465,11 @@
 
 	stride = output->current->width;
 	size = stride * 4 * output->current->height;
-	recorder->frame = malloc(size);
+	recorder->frame = zalloc(size);
 	recorder->rect = malloc(size);
 	recorder->total = 0;
 	recorder->count = 0;
 	recorder->output = output;
-	memset(recorder->frame, 0, size);
 
 	if (do_yflip)
 		recorder->tmpbuf = NULL;