tipc: remove active flag from tipc_bearer structure

After the allocation of tipc_bearer structure instance is converted
from statical way to dynamical way, we identify whether a certain
tipc_bearer structure pointer is valid by checking whether the pointer
is NULL or not. So the active flag in tipc_bearer structure becomes
redundant.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/link.c

@@ -1458,10 +1458,6 @@ void tipc_rcv(struct sk_buff *head, struct tipc_bearer *b_ptr)
 		head = head->next;
 		buf->next = NULL;
 
-		/* Ensure bearer is still enabled */
-		if (unlikely(!b_ptr->active))
-			goto discard;
-
 		/* Ensure message is well-formed */
 		if (unlikely(!link_recv_buf_validate(buf)))
 			goto discard;