[gnome-disk-utility] Use correct callback finish method

[Ondrej Holy <oholy src gnome org>]

commit 86f414cebc8d61445cf584aa88e044a53f9d76df
Author: Kai Lüke <kailueke riseup net>
Date:   Fri Apr 28 15:48:18 2017 +0200

    Use correct callback finish method
    
    The gdu_window_ensure_unused_list variant was used to
    initiate the callback, so _ensure_unused_list_finish
    should also be used in it instead of _ensure_unused_finish.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=780865

 src/disks/gduwindow.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/disks/gduwindow.c b/src/disks/gduwindow.c
index 9b0fdcc..fc7801e 100644
--- a/src/disks/gduwindow.c
+++ b/src/disks/gduwindow.c
@@ -3237,7 +3237,7 @@ power_off_ensure_unused_cb (GduWindow     *window,
                             gpointer       user_data)
 {
   UDisksObject *object = UDISKS_OBJECT (user_data);
-  if (gdu_window_ensure_unused_finish (window, res, NULL))
+  if (gdu_window_ensure_unused_list_finish (window, res, NULL))
     {
       UDisksDrive *drive = udisks_object_peek_drive (object);
       udisks_drive_call_power_off (drive,