block/nbd: BDRVNBDState: drop unused connect_err and connect_status

These fields are write-only. Drop them.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Roman Kagan <rvkagan@yandex-team.ru>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210610100802.5888-10-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

block/nbd.c

@@ -121,8 +121,6 @@ typedef struct BDRVNBDState {
     bool wait_drained_end;
     int in_flight;
     NBDClientState state;
-    int connect_status;
-    Error *connect_err;
     bool wait_in_flight;
 
     QEMUTimer *reconnect_delay_timer;
@@ -578,7 +576,6 @@ static void nbd_co_establish_connection_cancel(BlockDriverState *bs)
 static coroutine_fn void nbd_reconnect_attempt(BDRVNBDState *s)
 {
     int ret;
-    Error *local_err = NULL;
 
     if (!nbd_client_connecting(s)) {
         return;
@@ -619,14 +616,14 @@ static coroutine_fn void nbd_reconnect_attempt(BDRVNBDState *s)
         s->ioc = NULL;
     }
 
-    if (nbd_co_establish_connection(s->bs, &local_err) < 0) {
+    if (nbd_co_establish_connection(s->bs, NULL) < 0) {
         ret = -ECONNREFUSED;
         goto out;
     }
 
     bdrv_dec_in_flight(s->bs);
 
-    ret = nbd_client_handshake(s->bs, &local_err);
+    ret = nbd_client_handshake(s->bs, NULL);
 
     if (s->drained) {
         s->wait_drained_end = true;
@@ -641,11 +638,6 @@ static coroutine_fn void nbd_reconnect_attempt(BDRVNBDState *s)
     bdrv_inc_in_flight(s->bs);
 
 out:
-    s->connect_status = ret;
-    error_free(s->connect_err);
-    s->connect_err = NULL;
-    error_propagate(&s->connect_err, local_err);
-
     if (ret >= 0) {
         /* successfully connected */
         s->state = NBD_CLIENT_CONNECTED;