[gnome-software] trivial: Fix a -Wconst compile warning

[Richard Hughes <rhughes src gnome org>]

commit fc653fcb75c2f4384f276d4c473469b14a3b5231
Author: Richard Hughes <richard hughsie com>
Date:   Tue Mar 7 09:16:48 2017 +0000

    trivial: Fix a -Wconst compile warning

 src/gs-plugin-loader.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/gs-plugin-loader.c b/src/gs-plugin-loader.c
index 9f43992..7e272f5 100644
--- a/src/gs-plugin-loader.c
+++ b/src/gs-plugin-loader.c
@@ -365,7 +365,8 @@ gs_plugin_loader_create_event_from_error (GsPluginLoader *plugin_loader,
 }
 
 static gboolean
-gs_plugin_loader_is_error_fatal (GsPluginFailureFlags failure_flags, GError *err)
+gs_plugin_loader_is_error_fatal (GsPluginFailureFlags failure_flags,
+                                const GError *err)
 {
        if (failure_flags & GS_PLUGIN_FAILURE_FLAGS_FATAL_ANY)
                return TRUE;