GFS2: Banish struct gfs2_dinode_host

The final field in gfs2_dinode_host was the i_flags field. Thats
renamed to i_diskflags in order to avoid confusion with the existing
inode flags, and moved into the inode proper at a suitable location
to avoid creating a "hole".

At that point struct gfs2_dinode_host is no longer needed and as
promised (quite some time ago!) it can now be removed completely.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 188d0a2..228a465 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -1013,7 +1013,7 @@
 
 	if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
 		return;
-	if (ip->i_di.di_flags & GFS2_DIF_SYSTEM)
+	if (ip->i_diskflags & GFS2_DIF_SYSTEM)
 		return;
 
 	for (x = 0; x < al->al_qd_num; x++) {