DBus: fix scale on setting volume

1.0 is nominal, not maximum. This is consistent with both VLC and the
MPRIS 2.1 specification. Also, the setter ought to have the same scale
as the getter!

modules/control/dbus/dbus_player.c

@@ -201,14 +201,12 @@ DBUS_METHOD( VolumeSet )
     if( VLC_SUCCESS != DemarshalSetPropertyValue( p_from, &d_dbus_vol ) )
         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 
-    if( d_dbus_vol > 1. )
-        d_dbus_vol = 1.;
-    else if( d_dbus_vol < 0. )
+    d_dbus_vol *= AOUT_VOLUME_DEFAULT;
+    if( d_dbus_vol < 0. )
         d_dbus_vol = 0.;
-
-    double d_vol = d_dbus_vol * AOUT_VOLUME_MAX;
-    audio_volume_t i_vol = round( d_vol );
-    aout_VolumeSet( PL, i_vol );
+    if( d_dbus_vol > AOUT_VOLUME_MAX )
+        d_dbus_vol = AOUT_VOLUME_MAX;
+    aout_VolumeSet( PL, lround(d_dbus_vol) );
 
     REPLY_SEND;
 }