[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_file.c b/fs/gfs2/ops_file.c
index 7ea4175..b52b9db 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -425,7 +425,7 @@
 	gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
 	file->private_data = fp;
 
-	if (S_ISREG(ip->i_di.di_mode)) {
+	if (S_ISREG(ip->i_inode.i_mode)) {
 		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
 					   &i_gh);
 		if (error)
@@ -515,7 +515,7 @@
 
 	if (!(fl->fl_flags & FL_POSIX))
 		return -ENOLCK;
-	if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
+	if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
 		return -ENOLCK;
 
 	if (sdp->sd_args.ar_localflocks) {
@@ -617,7 +617,7 @@
 
 	if (!(fl->fl_flags & FL_FLOCK))
 		return -ENOLCK;
-	if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
+	if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
 		return -ENOLCK;
 
 	if (sdp->sd_args.ar_localflocks)