[gnome-music/wip/jfelder/mpris-fix-seek] smoothscale: Use GObject property syntax for duration

[Jean Felder <jfelder src gnome org>]

commit f311012e93d325d95a35e81f9e5a7550476f20b9
Author: Jean Felder <jfelder src gnome org>
Date:   Sat Oct 20 09:32:41 2018 +0200

    smoothscale: Use GObject property syntax for duration

 gnomemusic/widgets/smoothscale.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gnomemusic/widgets/smoothscale.py b/gnomemusic/widgets/smoothscale.py
index 701a82be..d7ad2a8d 100644
--- a/gnomemusic/widgets/smoothscale.py
+++ b/gnomemusic/widgets/smoothscale.py
@@ -109,7 +109,7 @@ class SmoothScale(Gtk.Scale):
 
     @log
     def _on_duration_changed(self, klass, arguments):
-        duration = self._player.duration
+        duration = self._player.props.duration
 
         if duration != -1.:
             self.set_range(0.0, duration * 60)
@@ -173,7 +173,7 @@ class SmoothScale(Gtk.Scale):
         """
         # Do not run until SmoothScale has been realized and GStreamer
         # provides a duration.
-        duration = self._player.duration
+        duration = self._player.props.duration
         if (self.get_realized() is False
                 or duration == -1.):
             return