collectgarbage count change to lua 5.3

lualib/skynet/debug.lua

@@ -14,8 +14,8 @@ local function init(skynet, export)
 		dbgcmd = {}
 
 		function dbgcmd.MEM()
-			local kb, bytes = collectgarbage "count"
-			skynet.ret(skynet.pack(kb,bytes))
+			local kb = collectgarbage "count"
+			skynet.ret(skynet.pack(kb))
 		end
 
 		function dbgcmd.GC()

service/launcher.lua

@@ -45,7 +45,7 @@ end
 function command.MEM()
 	local list = {}
 	for k,v in pairs(services) do
-		local ok, kb, bytes = pcall(skynet.call,k,"debug","MEM")
+		local ok, kb = pcall(skynet.call,k,"debug","MEM")
 		if not ok then
 			list[skynet.address(k)] = string.format("ERROR (%s)",v)
 		else