volser: Set but not used variables

volser: Set but not used variables

Fix instances of variables defined and set but never used in the
volser directory.

Spotted by gcc 4.6

Reviewed-on: http://gerrit.openafs.org/2852
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 0cac17105b632f495a8000a06a721e0bb163e2f4)
Change-Id: I7aa9b2673359f374ecf4cf4c63eaa9ad9ed20171
Reviewed-on: http://gerrit.openafs.org/2930