debugfs: remove rmdir() non-empty complaint

Hi,

This patch kills the pointless debugfs rmdir() printk() when called on a
non-empty directory. blktrace will sometimes have to call it a few times
when forcefully ending a trace, which polutes the log with pointless
warnings.

Rationale:

- It's more code to work-around this "problem" in the debugfs users, and
  you would have to add code to check for empty directories to do so (or
  assume that debugfs is using simple_ helpers, but that would be a
  layering violation).

- Other rmdir() implementations don't complain about something this
  silly.
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

fs/debugfs/inode.c

@@ -345,11 +345,6 @@ void debugfs_remove(struct dentry *dentry)
 			switch (dentry->d_inode->i_mode & S_IFMT) {
 			case S_IFDIR:
 				ret = simple_rmdir(parent->d_inode, dentry);
-				if (ret)
-					printk(KERN_ERR
-						"DebugFS rmdir on %s failed : "
-						"directory not empty.\n",
-						dentry->d_name.name);
 				break;
 			case S_IFLNK:
 				kfree(dentry->d_inode->i_private);