[gnome-boxes] wizard: Handle return value of prepare()

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit a72de39a7d49c429c58ad0b0138cf728e5c56745
Author: Lasse Schuirmann <lasse schuirmann gmail com>
Date:   Mon Oct 27 17:25:04 2014 +0100

    wizard: Handle return value of prepare()
    
    This way if InstallerMedia.prepare is cancelled, it returns false and
    Wizard stops continuing with rest of preparation.
    
    This fixes the issue of Wizard jumping to setup page after driver
    download is finished even if user has cancelled their request to create
    the corresponding VM.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=725386

 src/wizard.vala |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/wizard.vala b/src/wizard.vala
index a0f77a3..949935f 100644
--- a/src/wizard.vala
+++ b/src/wizard.vala
@@ -343,7 +343,8 @@ private class Boxes.Wizard: Gtk.Stack, Boxes.UI {
         else
             prepare_media_progress = progress;
         prepare_media_progress.bind_property ("info", prep_status_label, "label");
-        yield install_media.prepare (prepare_media_progress, prepare_cancellable);
+        if (!yield install_media.prepare (prepare_media_progress, prepare_cancellable))
+            return;
 
         vm_creator = install_media.get_vm_creator ();
         prep_progress.fraction = 1.0;