[media] s5p-mfc: remove unnecessary calling to function video_devdata()

Since we have get vdev by calling video_devdata() at the beginning of
s5p_mfc_open(), we should just use vdev instead of calling video_devdata()
again in the following code.
Signed-off-by: Zhaowei Yuan <zhaowei.yuan@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/s5p-mfc/s5p_mfc.c

@@ -724,7 +724,7 @@ static int s5p_mfc_open(struct file *file)
 		ret = -ENOMEM;
 		goto err_alloc;
 	}
-	v4l2_fh_init(&ctx->fh, video_devdata(file));
+	v4l2_fh_init(&ctx->fh, vdev);
 	file->private_data = &ctx->fh;
 	v4l2_fh_add(&ctx->fh);
 	ctx->dev = dev;