[gnome-software/gnome-3-20] Don't show an error for newer, stricter GTK versions

[Richard Hughes <rhughes src gnome org>]

commit 46349801f0a654fc243f7ace90f6bf328df35006
Author: Richard Hughes <richard hughsie com>
Date:   Thu Oct 6 11:52:04 2016 +0100

    Don't show an error for newer, stricter GTK versions

 src/gs-application.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gs-application.c b/src/gs-application.c
index ed33f87..f6d166c 100644
--- a/src/gs-application.c
+++ b/src/gs-application.c
@@ -278,7 +278,7 @@ css_error (GtkCssProvider *provider,
            gpointer        data)
 {
   if (!g_error_matches (error, GTK_CSS_PROVIDER_ERROR, GTK_CSS_PROVIDER_ERROR_DEPRECATED))
-    g_error ("CSS parsing error: %s", error->message);
+    g_warning ("CSS parsing error: %s", error->message);
 }
 
 static void