[XFS] Fix build brakage from patch "Clean up dquot pincount code"

This is a fix for patch " Clean up dquot pincount code" which introduced a
build breakage due to a missing & in xfs_qm_dquot_logitem_pin.

SGI-PV: 986789

SGI-Modid: xfs-linux-melb:xfs-kern:32221a

Signed-off-by: Peter Leckie <pleckie@sgi.com>
Signed-off-by: Donald Douwsma <donaldd@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
diff --git a/fs/xfs/quota/xfs_dquot_item.c b/fs/xfs/quota/xfs_dquot_item.c
index e33f864..48f0810 100644
--- a/fs/xfs/quota/xfs_dquot_item.c
+++ b/fs/xfs/quota/xfs_dquot_item.c
@@ -96,7 +96,7 @@
 	xfs_dquot_t *dqp = logitem->qli_dquot;
 
 	ASSERT(XFS_DQ_IS_LOCKED(dqp));
-	atomic_inc(dqp->q_pincount);
+	atomic_inc(&dqp->q_pincount);
 }
 
 /*