s390/ctcm: fix potential memory leak

smatch complains about
drivers/s390/net/ctcm_mpc.c:1210 ctcmpc_unpack_skb() warn: possible memory leak of 'mpcginfo'

mpc_action_discontact() did not free mpcginfo. Consolidate the freeing in
ctcmpc_unpack_skb().

Fixes: 293d984f0e36 ("ctcm: infrastructure for replaced ctc driver")
Signed-off-by: Alexandra Winter <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/s390/net/ctcm_mpc.c

···
 		ctcm_clear_busy_do(dev);
 	}
 
-	kfree(mpcginfo);
-
 	return;
 
 }
···
 						CTCM_FUNTAIL, dev->name);
 			priv->stats.rx_dropped++;
 			/* mpcginfo only used for non-data transfers */
-			kfree(mpcginfo);
 			if (do_debug_data)
 				ctcmpc_dump_skb(pskb, -8);
 		}
+		kfree(mpcginfo);
 	}
 done:
 
···
 		}
 		break;
 	}
-	kfree(mpcginfo);
 
 	CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
 		__func__, ch->id, grp->outstanding_xid2,
···
 		mpc_validate_xid(mpcginfo);
 		break;
 	}
-	kfree(mpcginfo);
 	return;
 }