ocfs2: replace u8 by __u8 in ocfs2_fs.h

This patch replaces date type 'u8' with '__u8', which follows the coding style of ocfs2_fs.h, and portable to user space
for ocfs2-tools.

Signed-off-by: Coly Li <coly.li@suse.de>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
index e9431e4..1a1a679 100644
--- a/fs/ocfs2/ocfs2_fs.h
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -1202,7 +1202,7 @@
 /* Header of one chunk of a quota file */
 struct ocfs2_local_disk_chunk {
 	__le32 dqc_free;	/* Number of free entries in the bitmap */
-	u8 dqc_bitmap[0];	/* Bitmap of entries in the corresponding
+	__u8 dqc_bitmap[0];	/* Bitmap of entries in the corresponding
 				 * chunk of quota file */
 };