GFS2: fix warning message

This patch fixes a warning message introduced in the recent
"GFS2: aggressively issue revokes in gfs2_log_flush" patch.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index 0fa0dba..2b20d70 100644
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -270,7 +270,6 @@
 
 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
 {
-	struct gfs2_glock *gl = bd->bd_gl;
 	struct gfs2_trans *tr = current->journal_info;
 
 	BUG_ON(!list_empty(&bd->bd_list));