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>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 13db10b70e66..d8e386ceb0cd 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -17,6 +17,7 @@
 #include <linux/slab.h>
 #include <linux/crc32.h>
 #include <linux/magic.h>
+#include <linux/kobject.h>
 
 /*
  * For mount options