[gnome-builder] git: add missing return

[Christian Hergert <chergert src gnome org>]

commit f5418aa264f81b0ffddacf1aaef0283f38c5a4b5
Author: Christian Hergert <chergert redhat com>
Date:   Sat Apr 27 16:59:14 2019 -0700

    git: add missing return

 src/plugins/git/gbp-git-vcs-cloner.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/plugins/git/gbp-git-vcs-cloner.c b/src/plugins/git/gbp-git-vcs-cloner.c
index 44198577c..648bcfda2 100644
--- a/src/plugins/git/gbp-git-vcs-cloner.c
+++ b/src/plugins/git/gbp-git-vcs-cloner.c
@@ -170,6 +170,7 @@ gbp_git_vcs_cloner_clone_cb (GObject      *object,
     {
       g_dbus_error_strip_remote_error (error);
       ide_task_return_error (task, g_steal_pointer (&error));
+      return;
     }
 
   ide_task_return_boolean (task, TRUE);