Merge pull request #1734 from VOREStation/chemsmoke-fix

Fixes objects using walk_to() not being able to be garbage collected.

code/game/objects/items/weapons/grenades/flashbang.dm

@@ -91,6 +91,10 @@
 				M << "<span class='danger'>Your ears start to ring!</span>"
 		M.update_icons()
 
+/obj/item/weapon/grenade/flashbang/Destroy()
+	walk(src, 0) // Because we might have called walk_away, we must stop the walk loop or BYOND keeps an internal reference to us forever.
+	return ..()
+
 /obj/item/weapon/grenade/flashbang/clusterbang//Created by Polymorph, fixed by Sieve
 	desc = "Use of this weapon may constiute a war crime in your area, consult your local Colony Director."
 	name = "clusterbang"