debugfs: use list_next_entry() in debugfs_remove_recursive()

Change debugfs_remove_recursive() to use list_next_entry(child), no
changes in generated code.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Eilon Greenstein <eilong@broadcom.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/debugfs/inode.c

@@ -566,8 +566,7 @@ void debugfs_remove_recursive(struct dentry *dentry)
 	mutex_lock(&parent->d_inode->i_mutex);
 
 	if (child != dentry) {
-		next = list_entry(child->d_u.d_child.next, struct dentry,
-					d_u.d_child);
+		next = list_next_entry(child, d_u.d_child);
 		goto up;
 	}