fs/cramfs/inode.c: code cleanup

This patchset does some cleanup in fs/cramfs/inode.c:

Patch 1/3 removes an unused variable
Patch 2/3 replaces a hardcoded value with a preprocessor constant Patch 3/3 deletes some lines of code and removes a variable that is just used once

Diffed against 2.6.23-rc3-mm1