remove unused line

Author: cloudwu

examples/client.lua

@@ -15,7 +15,6 @@ local request = host:attach(sproto.new(proto.c2s))
 local fd = assert(socket.connect("127.0.0.1", 8888))
 
 local function send_package(fd, pack)
-	local size = #pack
 	local package = string.pack(">s2", pack)
 	socket.send(fd, package)
 end