configfs: don't bother with checks for mkdir/rmdir/unlink/symlink in root

just give root directory separate inode_operations without all those
methods...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c
index 07f6045..eb41adc 100644
--- a/fs/configfs/mount.c
+++ b/fs/configfs/mount.c
@@ -82,7 +82,7 @@
 	inode = configfs_new_inode(S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
 				   &configfs_root);
 	if (inode) {
-		inode->i_op = &configfs_dir_inode_operations;
+		inode->i_op = &configfs_root_inode_operations;
 		inode->i_fop = &configfs_dir_operations;
 		/* directory inodes start off with i_nlink == 2 (for "." entry) */
 		inc_nlink(inode);