exploit gone (#21605)

code/game/objects/items/weapons/powerfist.dm

@@ -89,7 +89,7 @@
 	if(!tank)
 		to_chat(user, "<span class='warning'>[src] can't operate without a source of gas!</span>")
 		return
-	if(tank && !tank.air_contents.remove(gasperfist * fisto_setting))
+	if(tank && !tank.air_contents.boolean_remove(gasperfist * fisto_setting))
 		to_chat(user, "<span class='warning'>[src]'s piston-ram lets out a weak hiss, it needs more gas!</span>")
 		playsound(loc, 'sound/effects/refill.ogg', 50, 1)
 		return

code/modules/atmospherics/gasmixtures/gas_mixture.dm

@@ -111,6 +111,12 @@ What are the archived variables for?
 
 	return TRUE
 
+	/// Only removes the gas if we have more than the amount
+/datum/gas_mixture/proc/boolean_remove(amount)
+	if(amount > total_moles())
+		return FALSE
+	return remove(amount)
+
 	///Proportionally removes amount of gas from the gas_mixture.
 	///Returns: gas_mixture with the gases removed
 /datum/gas_mixture/proc/remove(amount)