cars.c: Test if memory was allocated in alloc_car since we previously only initialized without checking if it returned NULL.
cars.c: Test if memory was allocated in alloc_car since we previously
only initialized without checking if it returned NULL.

Formatted code, not sure when I decided using eight spaced tabs was the
cool thing to do.  This needs to be done to every file.  I don't trust
indenting software to do this for me since I fail with them every time.
It'll look better, some day.  I maybe promise.

nuggs/acStarter,nuggs/acStarter