bfcp: added bfcp_sock() accessor function, so we can use medianat in application

include/re_bfcp.h

@@ -260,6 +260,7 @@ const char *bfcp_prim_name(enum bfcp_prim prim);
 /* conn */
 int bfcp_listen(struct bfcp_conn **bcp, enum bfcp_transp tp, struct sa *laddr,
 		bfcp_recv_h *recvh, void *arg);
+void *bfcp_sock(const struct bfcp_conn *bc);
 
 
 /* request */

src/bfcp/conn.c

@@ -146,3 +146,9 @@ int bfcp_send(struct bfcp_conn *bc, const struct sa *dst, struct mbuf *mb)
 		return ENOSYS;
 	}
 }
+
+
+void *bfcp_sock(const struct bfcp_conn *bc)
+{
+	return bc ? bc->us : NULL;
+}