[PATCH] V4L/DVB: fix v4l2_device_call_all/v4l2_device_call_until_err macro

[Roel Kluin <roel.kluin@gmail.com>]

When these macros aren't called with 'grp_id' this will result in a
build failure.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
---
diff --git a/include/media/v4l2-device.h b/include/media/v4l2-device.h
index 9bf4ccc..ad86caa 100644
--- a/include/media/v4l2-device.h
+++ b/include/media/v4l2-device.h
@@ -94,16 +94,16 @@ void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);
 /* Call the specified callback for all subdevs matching grp_id (if 0, then
    match them all). Ignore any errors. Note that you cannot add or delete
    a subdev while walking the subdevs list. */
-#define v4l2_device_call_all(dev, grp_id, o, f, args...) 		\
+#define v4l2_device_call_all(dev, _grp_id, o, f, args...) 		\
 	__v4l2_device_call_subdevs(dev, 				\
-			!(grp_id) || sd->grp_id == (grp_id), o, f , ##args)
+			!(_grp_id) || sd->grp_id == (_grp_id), o, f , ##args)
 
 /* Call the specified callback for all subdevs matching grp_id (if 0, then
    match them all). If the callback returns an error other than 0 or
    -ENOIOCTLCMD, then return with that error code. Note that you cannot
    add or delete a subdev while walking the subdevs list. */
-#define v4l2_device_call_until_err(dev, grp_id, o, f, args...) 		\
+#define v4l2_device_call_until_err(dev, _grp_id, o, f, args...) 		\
 	__v4l2_device_call_subdevs_until_err(dev,			\
-		       !(grp_id) || sd->grp_id == (grp_id), o, f , ##args)
+		       !(_grp_id) || sd->grp_id == (_grp_id), o, f , ##args)
 
 #endif