Fix minor DOS in rev-list.
Fix minor DOS in rev-list.

A carefully crafted pathname can be used to disrupt downstream git-pack-objects
that uses 'git-rev-list --objects' output.  Prevent this.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git