Don't check side pressure if filter isn't.. filtering (#25019)

code/modules/atmospherics/machinery/components/trinary_devices/filter.dm

@@ -96,13 +96,13 @@
 /obj/machinery/atmospherics/trinary/filter/process_atmos()
 	..()
 	if(!on)
-		return 0
+		return FALSE
 
 	var/output_starting_pressure = air3.return_pressure()
 
-	if(output_starting_pressure >= target_pressure || air2.return_pressure() >= target_pressure)
+	if(output_starting_pressure >= target_pressure || (filter_type != FILTER_NOTHING && air2.return_pressure() >= target_pressure))
 		//No need to mix if target is already full!
-		return 1
+		return TRUE
 
 	//Calculate necessary moles to transfer using PV=nRT
 
@@ -158,7 +158,7 @@
 
 	parent1.update = 1
 
-	return 1
+	return TRUE
 
 /obj/machinery/atmospherics/trinary/filter/attack_ghost(mob/user)
 	ui_interact(user)

code/modules/atmospherics/machinery/datum_pipeline.dm

@@ -5,7 +5,7 @@
 	var/list/obj/machinery/atmospherics/pipe/members = list()
 	var/list/obj/machinery/atmospherics/other_atmosmch = list()
 
-	var/update = 1
+	var/update = TRUE
 
 /datum/pipeline/New()
 	SSair.networks += src
@@ -22,7 +22,7 @@
 
 /datum/pipeline/process()//This use to be called called from the pipe networks
 	if(update)
-		update = 0
+		update = FALSE
 		reconcile_air()
 	return
 
@@ -179,7 +179,7 @@
 				(partial_heat_capacity*target.heat_capacity/(partial_heat_capacity+target.heat_capacity))
 
 			air.temperature -= heat/total_heat_capacity
-	update = 1
+	update = TRUE
 
 /datum/pipeline/proc/reconcile_air()
 	var/list/datum/gas_mixture/GL = list()