Fixed MIN_MOBLINKTIME not working (#6904)

src/map/mob.cpp

@@ -1019,7 +1019,7 @@ int mob_linksearch(struct block_list *bl,va_list ap)
 	target = va_arg(ap, struct block_list *);
 	tick=va_arg(ap, t_tick);
 
-	if (md->mob_id == mob_id && status_has_mode(&md->status,MD_ASSIST) && DIFF_TICK(md->last_linktime, tick) < MIN_MOBLINKTIME
+	if (md->mob_id == mob_id && status_has_mode(&md->status,MD_ASSIST) && DIFF_TICK(tick, md->last_linktime) >= MIN_MOBLINKTIME
 		&& !md->target_id)
 	{
 		md->last_linktime = tick;
@@ -1481,7 +1481,7 @@ static int mob_ai_sub_hard_slavemob(struct mob_data *md,t_tick tick)
 	}
 
 	//Avoid attempting to lock the master's target too often to avoid unnecessary overload. [Skotlex]
-	if (DIFF_TICK(md->last_linktime, tick) < MIN_MOBLINKTIME && !md->target_id)
+	if (DIFF_TICK(tick, md->last_linktime) >= MIN_MOBLINKTIME && !md->target_id)
   	{
 		struct unit_data *ud = unit_bl2ud(bl);
 		md->last_linktime = tick;

src/map/unit.cpp

@@ -2770,7 +2770,7 @@ static int unit_attack_timer_sub(struct block_list* src, int tid, t_tick tick)
 			// Set mob's ANGRY/BERSERK states.
 			md->state.skillstate = md->state.aggressive?MSS_ANGRY:MSS_BERSERK;
 
-			if (status_has_mode(sstatus,MD_ASSIST) && DIFF_TICK(md->last_linktime, tick) < MIN_MOBLINKTIME) { 
+			if (status_has_mode(sstatus,MD_ASSIST) && DIFF_TICK(tick, md->last_linktime) >= MIN_MOBLINKTIME) { 
 				// Link monsters nearby [Skotlex]
 				md->last_linktime = tick;
 				map_foreachinrange(mob_linksearch, src, md->db->range2, BL_MOB, md->mob_id, target, tick);