BUG: Memory leak bug similar to a previous fixing commit a727596

[Snape3058]

https://github.com/shadowsocks/shadowsocks-libev/blob/e21f8248b64528b9a30a87331074a0eae6676225/src/jconf.c#L309

Similar to the memory leak that has been fixed with commit a727596, the argument returned by to_string will also get leaked after call to function parse_dscp.

[madeye]

Triaged — confirmed leak: parse_dscp(to_string(v)) in src/jconf.c (~line 309) never frees the heap string returned by to_string. Labeling bug.