f2fs: fix a build failure due to missing the kobject header
This patch should resolve the following error reported by kbuild test robot.
All error/warnings:
In file included from fs/f2fs/dir.c:13:0:
>> fs/f2fs/f2fs.h:435:17: error: field 's_kobj' has incomplete type
struct kobject s_kobj;
The failure was caused by missing the kobject header file in dir.c.
So, this patch move the header file to the right location, f2fs.h.
CC: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Jaegeuk Kim