[gnome-software/wip/temp/ubuntu-xenial-rebased: 261/326] Set error on failure

[Iain Lane <iainl src gnome org>]

commit cb46d1caaf727056a7276a1ff328dede1863cd3f
Author: William Hua <william hua canonical com>
Date:   Sun Apr 17 21:10:22 2016 -0400

    Set error on failure

 src/plugins/gs-ubuntu-snapd.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/plugins/gs-ubuntu-snapd.c b/src/plugins/gs-ubuntu-snapd.c
index 71d2368..f097a66 100644
--- a/src/plugins/gs-ubuntu-snapd.c
+++ b/src/plugins/gs-ubuntu-snapd.c
@@ -172,8 +172,11 @@ send_snapd_request (gboolean      authenticate,
 
                macaroon = gs_ubuntuone_get_macaroon (FALSE, TRUE, NULL);
 
-               if (macaroon == NULL)
+               if (macaroon == NULL) {
+                       g_set_error_literal (error, GS_PLUGIN_ERROR, GS_PLUGIN_ERROR_FAILED,
+                                            "failed to authenticate");
                        return FALSE;
+               }
 
                return send_snapd_request (TRUE,
                                           FALSE,