[gnome-software] trivial: Fix several issues with -Wno-discarded-qualifiers

[Richard Hughes <rhughes src gnome org>]

commit 34deda20aa1c7a8224757232967ad2824d672bd2
Author: Richard Hughes <richard hughsie com>
Date:   Thu Aug 25 11:38:23 2016 +0100

    trivial: Fix several issues with -Wno-discarded-qualifiers

 src/plugins/gs-desktop-common.h           |    2 +-
 src/plugins/gs-plugin-desktop-menu-path.c |    4 ++--
 src/plugins/gs-plugin-snap.c              |    2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/plugins/gs-desktop-common.h b/src/plugins/gs-desktop-common.h
index db78c4c..3fb94e9 100644
--- a/src/plugins/gs-desktop-common.h
+++ b/src/plugins/gs-desktop-common.h
@@ -34,7 +34,7 @@ typedef struct {
 
 typedef struct {
        const gchar     *id;
-       GsDesktopMap    *mapping;
+       const GsDesktopMap *mapping;
        const gchar     *name;
        const gchar     *icon;
        const gchar     *key_colors;
diff --git a/src/plugins/gs-plugin-desktop-menu-path.c b/src/plugins/gs-plugin-desktop-menu-path.c
index c0d6e38..63a098d 100644
--- a/src/plugins/gs-plugin-desktop-menu-path.c
+++ b/src/plugins/gs-plugin-desktop-menu-path.c
@@ -72,9 +72,9 @@ gs_plugin_refine_app (GsPlugin *plugin,
        /* find a top level category the app has */
        msdata = gs_desktop_get_data ();
        for (i = 0; !found && msdata[i].id != NULL; i++) {
-               GsDesktopData *data = &msdata[i];
+               const GsDesktopData *data = &msdata[i];
                for (j = 0; !found && data->mapping[j].id != NULL; j++) {
-                       GsDesktopMap *map = &data->mapping[j];
+                       const GsDesktopMap *map = &data->mapping[j];
                        if (g_strcmp0 (map->id, "all") == 0)
                                continue;
                        if (g_strcmp0 (map->id, "featured") == 0)
diff --git a/src/plugins/gs-plugin-snap.c b/src/plugins/gs-plugin-snap.c
index ae2387b..87c73f5 100644
--- a/src/plugins/gs-plugin-snap.c
+++ b/src/plugins/gs-plugin-snap.c
@@ -115,7 +115,7 @@ static void
 get_macaroon (GsPlugin *plugin, gchar **macaroon, gchar ***discharges)
 {
        GsAuth *auth;
-       gchar *serialized_macaroon;
+       const gchar *serialized_macaroon;
        g_autoptr(GVariant) macaroon_variant = NULL;
        g_autoptr (GError) error_local = NULL;