[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: NPeter Leckie <pleckie@sgi.com>
Signed-off-by: NDonald Douwsma <donaldd@sgi.com>
Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>

fs/xfs/quota/xfs_dquot_item.c

@@ -96,7 +96,7 @@ xfs_qm_dquot_logitem_pin(
 	xfs_dquot_t *dqp = logitem->qli_dquot;
 
 	ASSERT(XFS_DQ_IS_LOCKED(dqp));
-	atomic_inc(dqp->q_pincount);
+	atomic_inc(&dqp->q_pincount);
 }
 
 /*