Free SOC_s to a good home

• Fix a memory leak regarding implementation of SOC_ (improperly copypasted code from LUA_LoadLump!!)
• Optimise the repeated strlen usage into a single call, which is stored for later.

Special thanks to Sryder for discovery of the original issue.

Nice catch guys, I'm not entirely sure how I missed that before

merged

mentioned in commit 44ed8ceb