dm: sysfs revert add empty release function to avoid debug warning

Revert commit d2bb7df8 at Greg's request.

    Author: Milan Broz <mbroz@redhat.com>
    Date:   Thu Dec 10 23:51:53 2009 +0000

    dm: sysfs add empty release function to avoid debug warning

    This patch just removes an unnecessary warning:
     kobject: 'dm': does not have a release() function,
     it is broken and must be fixed.

    The kobject is embedded in mapped device struct, so
    code does not need to release memory explicitly here.

Cc: Greg KH <gregkh@suse.de>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>

drivers/md/dm-sysfs.c

@@ -79,13 +79,6 @@ static struct sysfs_ops dm_sysfs_ops = {
 	.show	= dm_attr_show,
 };
 
-/*
- * The sysfs structure is embedded in md struct, nothing to do here
- */
-static void dm_sysfs_release(struct kobject *kobj)
-{
-}
-
 /*
  * dm kobject is embedded in mapped_device structure
  * no need to define release function here
@@ -93,7 +86,6 @@ static void dm_sysfs_release(struct kobject *kobj)
 static struct kobj_type dm_ktype = {
 	.sysfs_ops	= &dm_sysfs_ops,
 	.default_attrs	= dm_attrs,
-	.release	= dm_sysfs_release
 };
 
 /*