Revert XactLockTableWait context setup in conditional multixact wait

There's no point in setting up a context error callback when doing
conditional lock acquisition, because we never actually wait and so the
able wouldn't be able to see it.

Backpatch to 9.4, where this was added.

Author: alvherre

src/backend/access/heap/heapam.c

@@ -109,8 +109,7 @@ static void MultiXactIdWait(MultiXactId multi, MultiXactStatus status, uint16 in
 				Relation rel, ItemPointer ctid, XLTW_Oper oper,
 				int *remaining);
 static bool ConditionalMultiXactIdWait(MultiXactId multi, MultiXactStatus status,
-						   uint16 infomask, Relation rel, ItemPointer ctid,
-						   XLTW_Oper oper, int *remaining);
+						   uint16 infomask, Relation rel, int *remaining);
 static XLogRecPtr log_heap_new_cid(Relation relation, HeapTuple tup);
 static HeapTuple ExtractReplicaIdentity(Relation rel, HeapTuple tup, bool key_modified,
 					   bool *copy);
@@ -4431,8 +4430,7 @@ heap_lock_tuple(Relation relation, HeapTuple tuple,
 				{
 					if (!ConditionalMultiXactIdWait((MultiXactId) xwait,
 												  status, infomask, relation,
-													&tuple->t_data->t_ctid,
-													XLTW_Lock, NULL))
+													NULL))
 						ereport(ERROR,
 								(errcode(ERRCODE_LOCK_NOT_AVAILABLE),
 								 errmsg("could not obtain lock on row in relation \"%s\"",
@@ -6244,11 +6242,10 @@ MultiXactIdWait(MultiXactId multi, MultiXactStatus status, uint16 infomask,
  */
 static bool
 ConditionalMultiXactIdWait(MultiXactId multi, MultiXactStatus status,
-						   uint16 infomask, Relation rel, ItemPointer ctid,
-						   XLTW_Oper oper, int *remaining)
+						   uint16 infomask, Relation rel, int *remaining)
 {
 	return Do_MultiXactIdWait(multi, status, infomask, true,
-							  rel, ctid, oper, remaining);
+							  rel, NULL, XLTW_None, remaining);
 }
 
 /*