[GFS2] Shrink gfs2_inode (3) - di_mode

This removes the duplicate di_mode field in favour of using the
inode->i_mode field. This saves 4 bytes.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c
index 9c786d1..8635175 100644
--- a/fs/gfs2/ops_super.c
+++ b/fs/gfs2/ops_super.c
@@ -407,7 +407,7 @@
 	if (error)
 		goto out_uninit;
 
-	if (S_ISDIR(ip->i_di.di_mode) &&
+	if (S_ISDIR(inode->i_mode) &&
 	    (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
 		error = gfs2_dir_exhash_dealloc(ip);
 		if (error)