libceph: eliminate connection state "DEAD"

The ceph connection state "DEAD" is never set and is therefore not
needed.  Eliminate it.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>

include/linux/ceph/messenger.h

@@ -119,7 +119,6 @@ struct ceph_msg_pos {
 #define CLOSED		10 /* we've closed the connection */
 #define SOCK_CLOSED	11 /* socket state changed to closed */
 #define OPENING         13 /* open connection w/ (possibly new) peer */
-#define DEAD            14 /* dead, about to kfree */
 #define BACKOFF         15
 
 /*

net/ceph/messenger.c

@@ -2087,12 +2087,6 @@ static int try_read(struct ceph_connection *con)
  */
 static void queue_con(struct ceph_connection *con)
 {
-	if (test_bit(DEAD, &con->state)) {
-		dout("queue_con %p ignoring: DEAD\n",
-		     con);
-		return;
-	}
-
 	if (!con->ops->get(con)) {
 		dout("queue_con %p ref count 0\n", con);
 		return;