[media] dvbdev: replace kcalloc with kzalloc

Since the number of elements equals to 1, so just use kzalloc to
simplify the code and make it more readable.
Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-core/dvbdev.c

@@ -620,8 +620,7 @@ int dvb_create_media_graph(struct dvb_adapter *adap,
 			return -ENOMEM;
 		adap->conn = conn;
 
-		adap->conn_pads = kcalloc(1, sizeof(*adap->conn_pads),
-					    GFP_KERNEL);
+		adap->conn_pads = kzalloc(sizeof(*adap->conn_pads), GFP_KERNEL);
 		if (!adap->conn_pads)
 			return -ENOMEM;