i2c: Let checkpatch shout on users of the legacy model

As suggested by Mauro Carvalho Chehab.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 02ea377..7907586 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -340,7 +340,8 @@
 ---------------------------
 
 What:	i2c_attach_client(), i2c_detach_client(), i2c_driver->detach_client()
-When:	2.6.29 (ideally) or 2.6.30 (more likely)
+When:	2.6.30
+Check:	i2c_attach_client i2c_detach_client
 Why:	Deprecated by the new (standard) device driver binding model. Use
 	i2c_driver->probe() and ->remove() instead.
 Who:	Jean Delvare <khali@linux-fr.org>