tipc: tipc_bcbearer_send(): simplify bearer selection

	for (bp_index = 0; bp_index < MAX_BEARERS; bp_index++) {

		struct tipc_bearer *p = bcbearer->bpairs[bp_index].primary;

		struct tipc_bearer *s = bcbearer->bpairs[bp_index].secondary;

		struct tipc_bearer *b = p;

		if (!p)

			break; /* No more bearers to try */

		tipc_nmap_diff(&bcbearer->remains, &p->nodes,

		if (tipc_bearer_blocked(p)) {

			if (!s || tipc_bearer_blocked(s))

				continue; /* Can't use either bearer */

			b = s;

		}

		tipc_nmap_diff(&bcbearer->remains, &b->nodes,

			       &bcbearer->remains_new);

		if (bcbearer->remains_new.count == bcbearer->remains.count)

			continue; /* Nothing added by bearer pair */

		if (!tipc_bearer_blocked(p))

			tipc_bearer_send(p, buf, &p->bcast_addr);

		else if (s && !tipc_bearer_blocked(s))

			/* unable to send on primary bearer */

			tipc_bearer_send(s, buf, &s->bcast_addr);

		else

			/* unable to send on either bearer */

			continue;

		tipc_bearer_send(b, buf, &b->bcast_addr);

		/* Swap bearers for next packet */

		if (s) {