Update src/ngx_http_lua_socket_tcp.c

change the return reminder

Co-authored-by: lijunlong <lijunlong@openresty.com>

Author: chensunny

src/ngx_http_lua_socket_tcp.c

@@ -874,7 +874,7 @@ ngx_http_lua_socket_tcp_bind(lua_State *L)
     if (n == 3) {
         if (!lua_isnumber(L, 3)) {
             lua_pushnil(L);
-            lua_pushliteral(L, "bad port number: need int type");
+            lua_pushliteral(L, "expecting port to be a number but got %s", xxxx);
             return 2;
         }