XFS: xfs_trans_add_item() - don't assign in ASSERT() when compare is intended

It looks to me like the two ASSERT()s in xfs_trans_add_item() really
want to do a compare (==) rather than assignment (=).
This patch changes it from the latter to the former.
Signed-off-by: NJesper Juhl <jj@chaosbits.net>
Signed-off-by: NBen Myers <bpm@sgi.com>

(cherry picked from commit 05293485)

fs/xfs/xfs_trans.c

@@ -1151,8 +1151,8 @@ xfs_trans_add_item(
 {
 	struct xfs_log_item_desc *lidp;
 
-	ASSERT(lip->li_mountp = tp->t_mountp);
-	ASSERT(lip->li_ailp = tp->t_mountp->m_ail);
+	ASSERT(lip->li_mountp == tp->t_mountp);
+	ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
 
 	lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS);