Merge branch 'master' of https://github.com/Citadel-Station-13/Citadel-Station-13 into Ghommie-cit265

code/modules/atmospherics/environmental/LINDA_fire.dm

@@ -199,7 +199,7 @@
 			var/radiated_temperature = location.air.temperature*FIRE_SPREAD_RADIOSITY_SCALE
 			for(var/t in location.atmos_adjacent_turfs)
 				var/turf/open/T = t
-				if(T.active_hotspot)
+				if(!T.active_hotspot)
 					T.hotspot_expose(radiated_temperature, CELL_VOLUME/4)
 
 	else

code/modules/atmospherics/environmental/LINDA_turf_tile.dm

@@ -15,7 +15,7 @@
 
 	//used for mapping and for breathing while in walls (because that's a thing that needs to be accounted for...)
 	//string parsed by /datum/gas/proc/copy_from_turf
-	var/initial_gas_mix = "o2=22;n2=82;TEMP=293.15"
+	var/initial_gas_mix = OPENTURF_DEFAULT_ATMOS
 	//approximation of MOLES_O2STANDARD and MOLES_N2STANDARD pending byond allowing constant expressions to be embedded in constant strings
 	// If someone will place 0 of some gas there, SHIT WILL BREAK. Do not do that.
 
@@ -72,11 +72,13 @@
 		air.copy_from(copy)
 
 /turf/return_air()
+	RETURN_TYPE(/datum/gas_mixture)
 	var/datum/gas_mixture/GM = new
 	GM.copy_from_turf(src)
 	return GM
 
 /turf/open/return_air()
+	RETURN_TYPE(/datum/gas_mixture)
 	return air
 
 /turf/temperature_expose()