driver: isdn: capi: remove cast for kmalloc return value

remove cast for kmalloc return value.
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/isdn/capi/capidrv.c

@@ -469,8 +469,7 @@ static int capidrv_add_ack(struct capidrv_ncci *nccip,
 {
 	struct ncci_datahandle_queue *n, **pp;
 
-	n = (struct ncci_datahandle_queue *)
-		kmalloc(sizeof(struct ncci_datahandle_queue), GFP_ATOMIC);
+	n = kmalloc(sizeof(struct ncci_datahandle_queue), GFP_ATOMIC);
 	if (!n) {
 		printk(KERN_ERR "capidrv: kmalloc ncci_datahandle failed\n");
 		return -1;