dm thin: fix missing pool reference count decrement in pool_ctr error path

commit ba30670f upstream.

Fixes: ac8c3f3d ("dm thin: generate event when metadata threshold passed")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

drivers/md/dm-thin.c

@@ -2531,7 +2531,7 @@ static int pool_ctr(struct dm_target *ti, unsigned argc, char **argv)
 						metadata_low_callback,
 						pool);
 	if (r)
-		goto out_free_pt;
+		goto out_flags_changed;
 
 	pt->callbacks.congested_fn = pool_is_congested;
 	dm_table_add_target_callbacks(ti->table, &pt->callbacks);