Daemon doesn't cleanup shared mem correctly on failed (c?)game load

[necessarily-equal]

Steps to reproduce:

1. add or trigger Sys::Drop in void CL_ParseGamestate, so that the the vm will crash
2. try starting unvanquished many time, /dev/shm will fill up (if that's where your shared memory is).
3. you will get a message like this: Warn: SV_LocateGameData: Shared memory region too small. /dev/shm is too full.

[slipher]

You're saying /dev/shm can leak something even after the process exits?

[necessarily-equal]

I seems so.

Note I haven't seen it first hand, but it seems to happen from the issues @cu-kai had yesterday.