ctcm: remove BUG_ONs

Remove BUG_ON's in ctcm driver, since the checked error conditions
are null pointer accesses.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/ctcm_main.c

@@ -1691,8 +1691,6 @@ static void ctcm_remove_device(struct ccwgroup_device *cgdev)
 {
 	struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
 
-	BUG_ON(priv == NULL);
-
 	CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
 			"removing device %p, proto : %d",
 			cgdev, priv->protocol);

drivers/s390/net/ctcm_mpc.c

@@ -1367,7 +1367,6 @@ static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
 	struct mpc_group *grp;
 	struct channel *wch;
 
-	BUG_ON(dev == NULL);
 	CTCM_PR_DEBUG("Enter %s: %s\n",	__func__, dev->name);
 
 	priv  = dev->ml_priv;
@@ -1472,8 +1471,6 @@ static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
 	struct channel *wch;
 	struct channel *rch;
 
-	BUG_ON(dev == NULL);
-
 	priv = dev->ml_priv;
 	grp = priv->mpcg;
 	wch = priv->channel[CTCM_WRITE];