v4l2videodec: fold property set/get PROP_OUTPUT_IO_MODE case into default

https://bugzilla.gnome.org/show_bug.cgi?id=791841
diff --git a/sys/v4l2/gstv4l2videodec.c b/sys/v4l2/gstv4l2videodec.c
index 8868d26..d1d1b95 100644
--- a/sys/v4l2/gstv4l2videodec.c
+++ b/sys/v4l2/gstv4l2videodec.c
@@ -66,10 +66,6 @@
   GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
 
   switch (prop_id) {
-    case PROP_OUTPUT_IO_MODE:
-      gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
-          pspec);
-      break;
     case PROP_CAPTURE_IO_MODE:
       gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
           pspec);
@@ -92,10 +88,6 @@
   GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
 
   switch (prop_id) {
-    case PROP_OUTPUT_IO_MODE:
-      gst_v4l2_object_get_property_helper (self->v4l2output, prop_id, value,
-          pspec);
-      break;
     case PROP_CAPTURE_IO_MODE:
       gst_v4l2_object_get_property_helper (self->v4l2capture, prop_id, value,
           pspec);