Push error when an error happens

tests/runtests.lua

@@ -179,10 +179,8 @@ runTest = thread:newFunction(function()
 		ec = ec + os.execute("lua tests/threadtests.lua p")
 		multi.print("Testing lanes threading")
 		ec = ec + os.execute("lua tests/threadtests.lua l")
-		if ec > 0 then
+		if ec ~= 0 then
 			os.exit(1)
-		else
-			os.exit()
 		end
 	end
 end)

tests/threadtests.lua

@@ -251,7 +251,6 @@ multi:newThread("Scheduler Thread",function()
 
     we_good = true
     multi:Stop() -- Needed in love2d tests to stop the main runner
-    os.exit()
 end).OnError(multi.error)
 
 multi.OnExit(function(err_or_errorcode)