IB/ipoib: Remove double pointer assigning

There is no need to assign "p" pointer twice.

This patch fixes the following smatch warning:
drivers/infiniband/ulp/ipoib/ipoib_cm.c:517 ipoib_cm_rx_handler() warn:
	missing break? reassigning 'p->id'

Fixes: 839fcaba ("IPoIB: Connected mode experimental support")
Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>

drivers/infiniband/ulp/ipoib/ipoib_cm.c

@@ -511,7 +511,6 @@ static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 	case IB_CM_REQ_RECEIVED:
 		return ipoib_cm_req_handler(cm_id, event);
 	case IB_CM_DREQ_RECEIVED:
-		p = cm_id->context;
 		ib_send_cm_drep(cm_id, NULL, 0);
 		/* Fall through */
 	case IB_CM_REJ_RECEIVED: