Check all(?) memory allocations (if you do it, do it completetly ;)

Check all(?) memory allocations (if you do it, do it completetly ;)
Fixed an overflow when more than MAX_SUBTITLE_FILES are detected.
Fixed a bunch of memory leaks.
Fixed removing sub/idx pair. (sizeof() != strlen on char*)
Clean up/Simplify (asprintf/calloc are usefull)
Cosmetics