hotfix for immutable mixtures (#368)

code/modules/atmospherics/gasmixtures/immutable_mixtures.dm

@@ -4,16 +4,14 @@
 /datum/gas_mixture/immutable
 	var/initial_temperature
 
-/datum/gas_mixture/immutable/proc/reset_gas_mix()
-	temperature = initial_temperature
-	temperature_archived = initial_temperature
-
 /datum/gas_mixture/immutable/New()
 	..()
-	reset_gas_mix()
+	garbage_collect()
 
 /datum/gas_mixture/immutable/garbage_collect()
-	reset_gas_mix()
+	temperature = initial_temperature
+	temperature_archived = initial_temperature
+	gases.Cut()
 
 /datum/gas_mixture/immutable/archive()
 	return 1 //nothing changes, so we do nothing and the archive is successful
@@ -26,11 +24,10 @@
 
 /datum/gas_mixture/immutable/share(datum/gas_mixture/sharer, atmos_adjacent_turfs = 4)
 	. = ..(sharer, 0)
-	reset_gas_mix()
+	garbage_collect()
 
 /datum/gas_mixture/immutable/after_share()
-	temperature = initial_temperature
-	reset_gas_mix()
+	garbage_collect()
 
 /datum/gas_mixture/immutable/react()
 	return 0 //we're immutable.
@@ -51,13 +48,11 @@
 	. = ..()
 	temperature = initial_temperature
 
+
 //used by space tiles
 /datum/gas_mixture/immutable/space
 	initial_temperature = TCMB
 
-/datum/gas_mixture/immutable/space/garbage_collect()
-	gases.Cut() //clever way of ensuring we always are empty.
-
 /datum/gas_mixture/immutable/space/heat_capacity()
 	return 7000
 
@@ -72,10 +67,10 @@
 /datum/gas_mixture/immutable/cloner
 	initial_temperature = T20C
 
-/datum/gas_mixture/immutable/cloner/reset_gas_mix()
-	assert_gas("n2")
-	gases["n2"][MOLES] = MOLES_O2STANDARD + MOLES_N2STANDARD
+/datum/gas_mixture/immutable/cloner/garbage_collect()
 	..()
+	add_gas("n2")
+	gases["n2"][MOLES] = MOLES_O2STANDARD + MOLES_N2STANDARD
 
 /datum/gas_mixture/immutable/cloner/heat_capacity()
 	return (MOLES_O2STANDARD + MOLES_N2STANDARD)*20 //specific heat of nitrogen is 20