volser: combine GCTrans conditional clauses

volser: combine GCTrans conditional clauses

In preparation for a future commit, combine two conditional clauses in
GCTrans().

No functional change should be incurred by this commit.

Reviewed-on: https://gerrit.openafs.org/13303
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit 95b0641ad8cfd0358576c6e1a93266fc59ecf710)

Change-Id: If808a00cf935235cdeb20bf73f03ad235f8b2c39
Reviewed-on: https://gerrit.openafs.org/13336
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Marcio Brito Barbosa <mbarbosa@sinenomine.net>
Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>