userok: Don't double check for expiry

userok: Don't double check for expiry

rxkad_GetServerInfo returns an error if you attempt to get server
information using a connection whose tokens have already expired.

The additional check for expiry in the userOK routines is therefore
not required - they'll never be reached, because GetServerInfo will
already have errored out.

Change-Id: I7b1a97249d40b12a2aae4009971a9b676700870e
Reviewed-on: http://gerrit.openafs.org/2753
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>