don't bother with ->d_inode->i_sb - it's always equal to ->d_sb

... and neither can ever be NULL

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index f8a0cd8..9b2ff353 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -1176,7 +1176,7 @@
 
 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
-	struct super_block *sb = d_inode(dentry)->i_sb;
+	struct super_block *sb = dentry->d_sb;
 	struct gfs2_sbd *sdp = sb->s_fs_info;
 	struct gfs2_statfs_change_host sc;
 	int error;