[gnome-software] snap: Fix authentication prompt not showing

[Robert Ancell <rancell src gnome org>]

commit f9ffaa6b937ca5fba95a237b6aed71f221650c77
Author: Robert Ancell <robert ancell canonical com>
Date:   Mon Jul 17 13:22:03 2017 +1200

    snap: Fix authentication prompt not showing

 plugins/snap/gs-plugin-snap.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/plugins/snap/gs-plugin-snap.c b/plugins/snap/gs-plugin-snap.c
index 50e4599..74f5650 100644
--- a/plugins/snap/gs-plugin-snap.c
+++ b/plugins/snap/gs-plugin-snap.c
@@ -78,10 +78,9 @@ snapd_error_convert (GError **perror)
        if (error->domain == SNAPD_ERROR) {
                switch (error->code) {
                case SNAPD_ERROR_AUTH_DATA_REQUIRED:
-                       g_set_error_literal (perror,
-                                            GS_PLUGIN_ERROR,
-                                            GS_PLUGIN_ERROR_AUTH_REQUIRED,
-                                            "Requires authentication with @snapd");
+                       error->code = GS_PLUGIN_ERROR_AUTH_REQUIRED;
+                       g_free (error->message);
+                       error->message = g_strdup ("Requires authentication with @snapd");
                        break;
                case SNAPD_ERROR_TWO_FACTOR_REQUIRED:
                        error->code = GS_PLUGIN_ERROR_PIN_REQUIRED;