[gnome-control-center] background: Add more information to run-time warning

[Bastien Nocera <hadess src gnome org>]

commit 99acb323d2bb4dd9717a6041f450d0fbf1af07a9
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Jun 7 18:23:53 2017 +0200

    background: Add more information to run-time warning
    
    It was impossible to know which background XML had an error with the
    original message.

 panels/background/cc-background-xml.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/panels/background/cc-background-xml.c b/panels/background/cc-background-xml.c
index e6e669d..60498d5 100644
--- a/panels/background/cc-background-xml.c
+++ b/panels/background/cc-background-xml.c
@@ -273,7 +273,7 @@ cc_background_xml_load_xml_internal (CcBackgroundXml *xml,
        } else if (!strcmp ((gchar *)wpa->name, "text")) {
          /* Do nothing here, libxml2 is being weird */
        } else {
-         g_warning ("Unknown Tag: %s", wpa->name);
+         g_warning ("Unknown Tag in %s: %s", filename, wpa->name);
        }
       }