Quick fixes for my last commit.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@2961 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/chemical/Chemistry-Machinery.dm

@@ -16,8 +16,11 @@
 	proc
 		recharge()
 			if(stat & BROKEN) return
-			if(energy != max_energy)
-				energy += 4
+			var/addenergy = 4
+			if(energy + addenergy > energy)
+				addenergy = energy - addenergy
+			if(energy < max_energy)
+				energy += addenergy
 				use_power(2000) // This thing uses up alot of power (this is still low as shit for creating reagents from thin air)
 			spawn(200) recharge()