Destroy tweaks.

Ports Destroy() proc tweaks from Paradise and /tg/, sourced from https://github.com/ParadiseSS13/Paradise/pull/2091.
Adds returns in Destroy()s, to prepare for future return values.

code/game/objects/items/devices/radio/headset.dm

@@ -33,7 +33,7 @@
 	qdel(keyslot2)
 	keyslot1 = null
 	keyslot2 = null
-	..()
+	return ..()
 
 /obj/item/device/radio/headset/list_channels(var/mob/user)
 	return list_secure_channels()

code/game/objects/items/devices/radio/radio.dm

@@ -32,7 +32,6 @@ var/global/list/default_medbay_channels = list(
 	var/frequency = PUB_FREQ //common chat
 	var/traitor_frequency = 0 //tune to frequency to unlock traitor supplies
 	var/canhear_range = 3 // the range which mobs can hear this radio from
-	var/obj/item/device/radio/patch_link = null
 	var/datum/wires/radio/wires = null
 	var/b_stat = 0
 	var/broadcasting = 0
@@ -71,7 +70,7 @@ var/global/list/default_medbay_channels = list(
 		radio_controller.remove_object(src, frequency)
 		for (var/ch_name in channels)
 			radio_controller.remove_object(src, radiochannels[ch_name])
-	..()
+	return ..()
 
 
 /obj/item/device/radio/initialize()

code/game/objects/items/weapons/explosives.dm

@@ -18,6 +18,11 @@
 	wires = new(src)
 	image_overlay = image('icons/obj/assemblies.dmi', "plastic-explosive2")
 	..()
+	
+/obj/item/weapon/plastique/Destroy()
+	qdel(wires)
+	wires = null
+	return ..()
 
 /obj/item/weapon/plastique/attackby(var/obj/item/I, var/mob/user)
 	if(istype(I, /obj/item/weapon/screwdriver))

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

@@ -8,27 +8,32 @@
 	slot_flags = SLOT_BELT
 	var/datum/effect/effect/system/smoke_spread/bad/smoke
 
-	New()
-		..()
-		src.smoke = PoolOrNew(/datum/effect/effect/system/smoke_spread/bad)
-		src.smoke.attach(src)
+/obj/item/weapon/grenade/smokebomb/New()
+	..()
+	src.smoke = PoolOrNew(/datum/effect/effect/system/smoke_spread/bad)
+	src.smoke.attach(src)
 
-	prime()
-		playsound(src.loc, 'sound/effects/smoke.ogg', 50, 1, -3)
-		src.smoke.set_up(10, 0, usr.loc)
-		spawn(0)
-			src.smoke.start()
-			sleep(10)
-			src.smoke.start()
-			sleep(10)
-			src.smoke.start()
-			sleep(10)
-			src.smoke.start()
+/obj/item/weapon/grenade/smokebomb/Destroy()
+	qdel(smoke)
+	smoke = null
+	return ..()
 
-		for(var/obj/effect/blob/B in view(8,src))
-			var/damage = round(30/(get_dist(B,src)+1))
-			B.health -= damage
-			B.update_icon()
-		sleep(80)
-		qdel(src)
-		return
+/obj/item/weapon/grenade/smokebomb/prime()
+	playsound(src.loc, 'sound/effects/smoke.ogg', 50, 1, -3)
+	src.smoke.set_up(10, 0, usr.loc)
+	spawn(0)
+		src.smoke.start()
+		sleep(10)
+		src.smoke.start()
+		sleep(10)
+		src.smoke.start()
+		sleep(10)
+		src.smoke.start()
+
+	for(var/obj/effect/blob/B in view(8,src))
+		var/damage = round(30/(get_dist(B,src)+1))
+		B.health -= damage
+		B.update_icon()
+	sleep(80)
+	qdel(src)
+	return