V4L/DVB (13428): cx18: Rename mdl_offset to mdl_base_idx or free_mdl_idx as appropriate

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/cx18/cx18-mailbox.c b/drivers/media/video/cx18/cx18-mailbox.c
index afe46c3..4a1249a 100644
--- a/drivers/media/video/cx18/cx18-mailbox.c
+++ b/drivers/media/video/cx18/cx18-mailbox.c
@@ -178,8 +178,8 @@
 		 * and send them back to q_free for fw rotation eventually.
 		 */
 		if ((order->flags & CX18_F_EWO_MB_STALE_UPON_RECEIPT) &&
-		    !(id >= s->mdl_offset &&
-		      id < (s->mdl_offset + s->buffers))) {
+		    !(id >= s->mdl_base_idx &&
+		      id < (s->mdl_base_idx + s->buffers))) {
 			CX18_WARN("Fell behind! Ignoring stale mailbox with "
 				  " inconsistent data. Lost buffer for mailbox "
 				  "seq no %d\n", mb->request);