Unused variable cleanup

Unused variable cleanup

Eliminate some warnings for unused variables.  In most cases the
variables are not used at all and are removed; in a few cases the
declarations need to be ifdef'ed to follow the code that uses them.
For a typical build here this removes 24 warnings.

Reviewed-on: http://gerrit.openafs.org/232
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Derrick Brashear <shadow@dementia.org>