luacheck tuned and warnings fixed

Author: xHasKx

.luacheckrc

@@ -11,6 +11,7 @@ max_line_length = 200
 files["mqtt/**"] = {
 	ignore = {
 		"113/unpack",
+		"212/.+_",						-- unused argument value_
 	}
 }
 

mqtt/ngxsocket.lua

@@ -4,7 +4,7 @@ local ngxsocket = {}
 
 -- load required stuff
 local string_sub = string.sub
-local ngx_socket_tcp = ngx.socket.tcp
+local ngx_socket_tcp = ngx.socket.tcp -- luacheck: ignore
 
 -- Open network connection to .host and .port in conn table
 -- Store opened socket to conn table

mqtt/protocol5.lua

@@ -806,8 +806,8 @@ end
 -- Returns packet on success or false and error message on failure
 function protocol5.parse_packet(read_func)
 	assert(type(read_func) == "function", "expecting read_func to be a function")
+	local byte1, byte2, err, len, data, rc, ok, packet, topic, packet_id
 	-- parse fixed header
-	local byte1, byte2, err, len, data, rc, ok, packet, topic, packet_id, rc
 	byte1, err = read_func(1)
 	if not byte1 then
 		return false, "failed to read first byte: "..err