- fixed crash in actor iterator

Level pointer should passed to FActorIterator contructor regardless of 'last look actor' because the latter can be null

https://forum.zdoom.org/viewtopic.php?t=63304

src/actorinlines.h

@@ -124,7 +124,7 @@ public:
 	FActorIterator (FLevelLocals *l, int i) : Level(l), base (nullptr), id (i)
 	{
 	}
-	FActorIterator (int i, AActor *start) : Level(start->Level), base (start), id (i)
+	FActorIterator (FLevelLocals *l, int i, AActor *start) : Level(l), base (start), id (i)
 	{
 	}
 	AActor *Next ()

src/p_enemy.cpp

@@ -1340,7 +1340,7 @@ int P_LookForTID (AActor *actor, INTBOOL allaround, FLookExParams *params)
 		actor->LastLookActor = nullptr;
 	}
 
-	FActorIterator iterator (actor->TIDtoHate, actor->LastLookActor);
+	FActorIterator iterator (actor->Level, actor->TIDtoHate, actor->LastLookActor);
 	int c = (pr_look3() & 31) + 7;	// Look for between 7 and 38 hatees at a time
 	while ((other = iterator.Next()) != actor->LastLookActor)
 	{