v4l2: Fix capture/output-io-mode properties

There was some miss-match in the implementation. This makes it
concistent, though functionally it worked, except the video decoder
output-io-mode getter.
diff --git a/sys/v4l2/gstv4l2transform.c b/sys/v4l2/gstv4l2transform.c
index 42aeb13..f617ac4 100644
--- a/sys/v4l2/gstv4l2transform.c
+++ b/sys/v4l2/gstv4l2transform.c
@@ -73,8 +73,8 @@
           pspec);
       break;
     case PROP_CAPTURE_IO_MODE:
-      gst_v4l2_object_set_property_helper (self->v4l2capture, PROP_IO_MODE,
-          value, pspec);
+      gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
+          pspec);
       break;
 
       /* By default, only set on output */
diff --git a/sys/v4l2/gstv4l2videodec.c b/sys/v4l2/gstv4l2videodec.c
index f06e4f6..142dbeb 100644
--- a/sys/v4l2/gstv4l2videodec.c
+++ b/sys/v4l2/gstv4l2videodec.c
@@ -90,13 +90,13 @@
   GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
 
   switch (prop_id) {
-    case PROP_IO_MODE:
+    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->v4l2output, PROP_IO_MODE,
-          value, pspec);
+      gst_v4l2_object_get_property_helper (self->v4l2capture, prop_id, value,
+          pspec);
       break;
 
       /* By default read from output */