[gnome-sound-recorder] remove bus watch after stop recording

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit c2625e960e363116972b871ac4edc79145c1f738
Author: Kavan Mevada <kavanmevada gmail com>
Date:   Wed Jun 3 20:03:06 2020 +0530

    remove bus watch after stop recording

 src/record.js | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/src/record.js b/src/record.js
index 9713dbb..4e60cb4 100644
--- a/src/record.js
+++ b/src/record.js
@@ -97,7 +97,7 @@ var Record = new GObject.registerClass({
             this.pipeline = new Gst.Pipeline({ name: 'pipe' });
             this.srcElement = Gst.ElementFactory.make('pulsesrc', 'srcElement');
             this.audioConvert = Gst.ElementFactory.make('audioconvert', 'audioConvert');
-            this.caps = Gst.Caps.from_string(`audio/x-raw, channels=${this._getChannels()}`);
+            this.caps = Gst.Caps.from_string(`audio/x-raw`);
             this.level = Gst.ElementFactory.make('level', 'level');
             this.volume = Gst.ElementFactory.make('volume', 'volume');
             this.ebin = Gst.ElementFactory.make('encodebin', 'ebin');
@@ -166,8 +166,11 @@ var Record = new GObject.registerClass({
             this.timeout = null;
         }
 
-        this.recordBus.remove_watch();
-        this.recordBus = null;
+        if (this.recordBus) {
+            this.recordBus.remove_watch();
+            this.recordBus = null;
+        }
+
 
         this.duration = 0;
     }