[Bug] Segfault in git status

Hi all-

Somehow I've managed to create a repository that causes git status to  
segfault. To be honest, I'm not entirely sure how just yet. This comes  
after a weekend of splitting a repository into two separate  
repositories, filtering out a directory from one, and then creating  
grafts in those repositories to skip commits that now change nothing.

This was in OS X 10.5.2 with git compiled from cf5c51e. Falling back  
to 1.5.4.2 cleared it up, so with the help of git bisect I've narrowed  
the bug down to cf55870.

I'll spend some time this week trying to find the exact point in my  
filtering that git status went south and report back if I can  
replicate it in a more-controlled test.

-Dane