GFS2: Don't use _raw version of RCU dereference

As per RCU glock patch review comments, don't use the _raw
version of this function here.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

fs/gfs2/glock.c

@@ -1723,7 +1723,7 @@ static inline struct gfs2_glock *glock_hash_chain(unsigned hash)
 
 static inline struct gfs2_glock *glock_hash_next(struct gfs2_glock *gl)
 {
-	return hlist_bl_entry(rcu_dereference_raw(gl->gl_list.next),
+	return hlist_bl_entry(rcu_dereference(gl->gl_list.next),
 			      struct gfs2_glock, gl_list);
 }