[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/inode.h b/fs/gfs2/inode.h
index 33c9ea6..69cbf98 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -22,7 +22,7 @@
 
 static inline int gfs2_is_dir(struct gfs2_inode *ip)
 {
-	return S_ISDIR(ip->i_di.di_mode);
+	return S_ISDIR(ip->i_inode.i_mode);
 }
 
 void gfs2_inode_attr_in(struct gfs2_inode *ip);