[GFS2] Some further style changes

Introduce a couple of new constants which make the NFS filehandle
sizes that GFS2 uses a bit clearer. Also fix one or two minor
issues as per Jan Engelhardt's sixth email.

Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c
index 6ced712..820db93 100644
--- a/fs/gfs2/ops_super.c
+++ b/fs/gfs2/ops_super.c
@@ -79,7 +79,7 @@
 		return;
 
 	if (!strncmp(sb->s_type->name, "gfs2meta", 8))
-		return; /* meta fs. don't do nothin' */
+		return; /* Nothing to do */
 
 	/*  Unfreeze the filesystem, if we need to  */
 
@@ -136,7 +136,6 @@
 	/*  At this point, we're through participating in the lockspace  */
 	gfs2_sys_fs_del(sdp);
 	vfree(sdp);
-	sb->s_fs_info = NULL;
 }
 
 /**
@@ -149,8 +148,7 @@
 
 static void gfs2_write_super(struct super_block *sb)
 {
-	struct gfs2_sbd *sdp = sb->s_fs_info;
-	gfs2_log_flush(sdp, NULL);
+	gfs2_log_flush(sb->s_fs_info, NULL);
 }
 
 /**