A few bugs in SVN

[joevenzon]

I don't think it's due to replays. The last line is my bipointer class (a poorly named smart-ish pointer class) telling us that someone asked for a pointer that's NULL. If something's asking for a pointer that's NULL, it's probably because it's about to use it (and create a SEGFAULT). The only class using bipointers is the sound class, and it's used by the gl_car class to get a reference to newly created sources. Like I said, normally when you get a "src/sound.cpp,589: Sound file isn't in desired format" message, I'd throw an exception and have the game quit, because you're going to get a crash later. To say that another way, the game will crash if you get this message. So, don't be surprised. :-)