volinfo: fix -filenames option check

volinfo: fix -filenames option check

Fix the logic for checking the presense of the volinfo -filenames
option.  The original patch inadvertently added the -filenames
check as an if-else cause to the -orphaned flag check, which
prevents filenames from being printed when listing orphaned
vnodes.

Change-Id: I070d796e7ea9c0f5df9cf92a17eaa4004444d423
Reviewed-on: http://gerrit.openafs.org/4689
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>