[MIRROR] Weakref cleanup (#12704)

Co-authored-by: Will <7099514+Willburd@users.noreply.github.com>
Co-authored-by: Cameron Lennox <killer65311@gmail.com>

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

@@ -114,6 +114,7 @@
 		SSradio.remove_object(src, frequency)
 		for (var/ch_name in channels)
 			SSradio.remove_object(src, GLOB.radiochannels[ch_name])
+	bs_tx_weakref = null
 	return ..()
 
 /obj/item/radio/proc/recalculateChannels()

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

@@ -24,6 +24,7 @@
 	qdel(radio)
 	camera = null
 	radio = null
+	showing = null
 	. = ..()
 
 /obj/item/tvcamera/examine()