[GFS2] Remove one typedef

This removes one of the typedefs from the locking interface. It
is replaced by a forward declaration of the gfs2 superblock. The
other two are not so easy to solve since in their case, they
can refer to one of two possible structures.

Cc: David Teigland <teigland@redhat.com>
Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/locking/dlm/sysfs.c b/fs/gfs2/locking/dlm/sysfs.c
index c1237a91..29ae06f 100644
--- a/fs/gfs2/locking/dlm/sysfs.c
+++ b/fs/gfs2/locking/dlm/sysfs.c
@@ -102,7 +102,7 @@
 static ssize_t recover_store(struct gdlm_ls *ls, const char *buf, size_t len)
 {
 	ls->recover_jid = simple_strtol(buf, NULL, 0);
-	ls->fscb(ls->fsdata, LM_CB_NEED_RECOVERY, &ls->recover_jid);
+	ls->fscb(ls->sdp, LM_CB_NEED_RECOVERY, &ls->recover_jid);
 	return len;
 }