dlm: fix use count with multiple joins

When a lockspace was joined multiple times, the global dlm
use count was incremented when it should not have been.  This
caused the global dlm threads to not be stopped when all
lockspaces were eventually be removed.
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/lockspace.c

@@ -419,16 +419,14 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
 			break;
 		}
 		ls->ls_create_count++;
-		module_put(THIS_MODULE);
-		error = 1; /* not an error, return 0 */
+		*lockspace = ls;
+		error = 1;
 		break;
 	}
 	spin_unlock(&lslist_lock);
 
-	if (error < 0)
-		goto out;
 	if (error)
-		goto ret_zero;
+		goto out;
 
 	error = -ENOMEM;
 
@@ -583,7 +581,6 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
 	dlm_create_debug_file(ls);
 
 	log_debug(ls, "join complete");
- ret_zero:
 	*lockspace = ls;
 	return 0;
 
@@ -628,7 +625,9 @@ int dlm_new_lockspace(const char *name, int namelen, void **lockspace,
 	error = new_lockspace(name, namelen, lockspace, flags, lvblen);
 	if (!error)
 		ls_count++;
-	else if (!ls_count)
+	if (error > 0)
+		error = 0;
+	if (!ls_count)
 		threads_stop();
  out:
 	mutex_unlock(&ls_lock);