butc: Remove dead initialisation

code is set to a real value on every code path, so don't bother
initialising it to 0 midway through the function.

Change-Id: I334286f2ae854c57df781af8df78e5a1bf8e9b2b
Reviewed-on: http://gerrit.openafs.org/9256
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>