vlserver: Set but not used variables

vlserver: Set but not used variables

Remove some variables that are set but never used in the vlserver
directory:
- n1,n2,n3 and n4 in vlclient.c appear to have never been used even
in the original IBM code
- some variables in vldb_check.c that are no longer used after some
recent changes

Spotted by gcc 4.6

Change-Id: Icd9e7da151b3a485c917ed5bd99eb26998dfa818
Reviewed-on: http://gerrit.openafs.org/2784
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>