salvager: incorrect comment

The comment for the code handling the -showsuid option was incorrect.

Reviewed-on: http://gerrit.openafs.org/9109
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 4051c5e96e921b69ac2a6e7bcb805cbc0a8f7993)

Change-Id: Id19e063c9540e362b4d9478a0fce606084d470e6
Reviewed-on: http://gerrit.openafs.org/9523
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>