V4L/DVB (8428): videodev: rename 'dev' to 'parent'

The field 'dev' is not the video device, but the parent of the video device.
Rename accordingly.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 33f379b..5ae261f 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -89,7 +89,7 @@
 
 	/* sysfs */
 	struct device class_dev;	/* v4l device */
-	struct device *dev;		/* device parent */
+	struct device *parent;		/* device parent */
 
 	/* device info */
 	char name[32];