- consolidated the check for "is actor an owned inventory item" into a subfunction.

This check occured 9 times in the source, better have it only once.

src/c_cmds.cpp

@@ -914,10 +914,7 @@ static bool IsActorACountItem(AActor *mo)
 // [SP] for all actors
 static bool IsActor(AActor *mo)
 {
-	if (mo->IsKindOf(RUNTIME_CLASS(AInventory)))
-		return static_cast<AInventory *>(mo)->Owner == NULL; // [SP] Exclude inventory-owned items
-	else
-		return true;
+	return mo->IsMapActor();
 }
 
 // [SP] modified - now allows showing count only, new arg must be passed. Also now still counts regardless, if lists are printed.