ext4: let ext4_readdir handle inline data

For "." and "..", we just call filldir by ourselves
instead of iterating the real dir entry.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --cc fs/ext4/dir.c
Simple merge

diff --cc fs/ext4/ext4.h
Simple merge

diff --cc fs/ext4/inline.c
Simple merge

diff --cc fs/ext4/xattr.h
Simple merge