[gnome-shell] modemManager: Look for property on correct object

[Florian Müllner <fmuellner src gnome org>]

commit d9a75412c3e843890588a1e794f3014ee65e5619
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Sat Mar 14 14:42:43 2020 -0700

    modemManager: Look for property on correct object
    
    The SignalQuality property is defined on the GDBusProxy, not the modem
    JS object.
    Fix this runtime warning:
    
    JS WARNING: [resource:///org/gnome/shell/misc/modemManager.js 252]: reference to undefined property 
"SignalQuality"
    JS ERROR: TypeError: this.SignalQuality is undefined
    _reloadSignalQuality@resource:///org/gnome/shell/misc/modemManager.js:252:34
    _init@resource:///org/gnome/shell/misc/modemManager.js:234:14
    NMDeviceModem@resource:///org/gnome/shell/ui/status/network.js:517:34
    _deviceAdded@resource:///org/gnome/shell/ui/status/network.js:1755:27
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1097

 js/misc/modemManager.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/misc/modemManager.js b/js/misc/modemManager.js
index 21e49e81c5..4cc810bbb6 100644
--- a/js/misc/modemManager.js
+++ b/js/misc/modemManager.js
@@ -249,7 +249,7 @@ var BroadbandModem = GObject.registerClass({
     }
 
     _reloadSignalQuality() {
-        let [quality, recent_] = this.SignalQuality;
+        let [quality, recent_] = this._proxy.SignalQuality;
         this._setSignalQuality(quality);
     }