ext4: let empty_dir handle inline dir

empty_dir is used when deleting a dir.  So it should handle inline dir
properly.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index f86e424..7747bbc 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -180,6 +180,7 @@
 				    struct ext4_dir_entry_2 *de_del,
 				    struct buffer_head *bh,
 				    int *has_inline_data);
+extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
 # else  /* CONFIG_EXT4_FS_XATTR */
 
 static inline int
@@ -381,6 +382,11 @@
 {
 	return 0;
 }
+
+static inline int empty_inline_dir(struct inode *dir, int *has_inline_data)
+{
+	return 0;
+}
 # endif  /* CONFIG_EXT4_FS_XATTR */
 
 #ifdef CONFIG_EXT4_FS_SECURITY