GFS2: Remove unused sysfs file

The /sys/fs/gfs2/<fsname>/lock_module/id file has been unused for
some time now, so we can remove it. We still accept the mount option
though, as userspace still sends that.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 8e3f00e..52fb6c0 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -1028,7 +1028,6 @@
 
 	ls->ls_ops = lm;
 	ls->ls_first = 1;
-	ls->ls_id = 0;
 
 	for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
 		substring_t tmp[MAX_OPT_ARGS];
@@ -1046,10 +1045,7 @@
 			ls->ls_jid = option;
 			break;
 		case Opt_id:
-			ret = match_int(&tmp[0], &option);
-			if (ret)
-				goto hostdata_error;
-			ls->ls_id = option;
+			/* Obsolete, but left for backward compat purposes */
 			break;
 		case Opt_first:
 			ret = match_int(&tmp[0], &option);