[gnome-shell/wip/fmuellner/gjs-1.52-compat] fileUtils: Fix fallback code for old gjs

[Florian Müllner <fmuellner src gnome org>]

commit 2ed6290a40af124cd4aac5494173e98c19b3d2d6
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Sep 17 12:56:37 2018 +0200

    fileUtils: Fix fallback code for old gjs
    
    gjs's D-Bus convenience explicitly expects a string representation
    of an interface, but the new convenience method to load an XML
    description from a resource introduced in commit f42d9df3e0 only
    returns a string when using gjs from the GNOME 3.30 release. We
    have so far managed to keep compatibility with the previous stable
    gjs release, so fix up the fallback code to cast to string.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/issues/578

 js/misc/fileUtils.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/misc/fileUtils.js b/js/misc/fileUtils.js
index 81cd92c94..24add2e7e 100644
--- a/js/misc/fileUtils.js
+++ b/js/misc/fileUtils.js
@@ -90,7 +90,7 @@ function loadInterfaceXML(iface) {
         if (bytes instanceof Uint8Array)
             xml = imports.byteArray.toString(bytes)
         else
-            xml = bytes;
+            xml = bytes.toString();
     } catch (e) {
         log('Failed to load D-Bus interface ' + iface);
     }