Fixed dead monsters stuck after killed (#5263)

src/map/homunculus.cpp

@@ -1336,6 +1336,8 @@ int hom_ressurect(struct map_session_data* sd, unsigned char per, short x, short
 		clif_spawn(&hd->bl);
 	}
 
+	hd->ud.state.blockedmove = false;
+
 #ifdef RENEWAL
 	sc_start(&sd->bl, &sd->bl, SC_HOMUN_TIME, 100, 1, skill_get_time(AM_CALLHOMUN, 1));
 #endif

src/map/mob.cpp

@@ -1154,6 +1154,7 @@ int mob_spawn (struct mob_data *md)
 
 	md->state.aggressive = status_has_mode(&md->status,MD_ANGRY)?1:0;
 	md->state.skillstate = MSS_IDLE;
+	md->ud.state.blockedmove = false;
 	md->next_walktime = tick+rnd()%1000+MIN_RANDOMWALKTIME;
 	md->last_linktime = tick;
 	md->dmgtick = tick - 5000;

src/map/unit.cpp

@@ -811,7 +811,7 @@ static TIMER_FUNC(unit_walktobl_sub){
 	struct block_list *bl = map_id2bl(id);
 	struct unit_data *ud = bl?unit_bl2ud(bl):NULL;
 
-	if (ud && ud->walktimer == INVALID_TIMER && ud->target == data) {
+	if (ud && ud->walktimer == INVALID_TIMER && ud->target && ud->target == data) {
 		if (DIFF_TICK(ud->canmove_tick, tick) > 0) // Keep waiting?
 			add_timer(ud->canmove_tick+1, unit_walktobl_sub, id, data);
 		else if (unit_can_move(bl)) {
@@ -3041,6 +3041,9 @@ int unit_remove_map_(struct block_list *bl, clr_type clrtype, const char* file,
 	if (ud->walktimer != INVALID_TIMER)
 		unit_stop_walking(bl,0);
 
+	if (clrtype == CLR_DEAD)
+		ud->state.blockedmove = true;
+
 	if (ud->skilltimer != INVALID_TIMER)
 		unit_skillcastcancel(bl,0);