afsio: Remove unused 'code' value

afsio: Remove unused 'code' value

main always return 0, so don't bother getting an exit value back from
cmd_Dispatch that we have no intention of doing anything with.

Reviewed-on: http://gerrit.openafs.org/4997
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 8df379696ca6303cd2e4cd3eed34e4552725853b)

Change-Id: I6b01cf20bb2e08b73985ce069e24c196060cd711
Reviewed-on: http://gerrit.openafs.org/5390
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>