[gtksourceview/gnome-3-20] FileSaver: add missing return after g_task_return_error()

[Sébastien Wilmet <swilmet src gnome org>]

commit 6a07fdece90c059985e831101eddd233a0d46a40
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun May 8 12:22:22 2016 +0200

    FileSaver: add missing return after g_task_return_error()

 gtksourceview/gtksourcefilesaver.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtksourceview/gtksourcefilesaver.c b/gtksourceview/gtksourcefilesaver.c
index 865e378..b3410ea 100644
--- a/gtksourceview/gtksourcefilesaver.c
+++ b/gtksourceview/gtksourcefilesaver.c
@@ -977,6 +977,7 @@ mount_cb (GFile              *file,
        if (error != NULL)
        {
                g_task_return_error (saver->priv->task, error);
+               return;
        }
 
        check_externally_modified (saver);