Merge pull request #3953 from Citadel-Station-13/upstream-merge-32729

[MIRROR] removes an unused var from radio code

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

@@ -11,7 +11,6 @@
 	var/frequency = 1459 //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/list/secure_radio_connections
 	var/prison_radio = 0
 	var/b_stat = 0
@@ -82,7 +81,6 @@
 	qdel(wires)
 	wires = null
 	remove_radio_all(src) //Just to be sure
-	patch_link = null
 	keyslot = null
 	return ..()