linux: make reading unixusers from proc actually work

our indentation did not match our braces so we would never read all the
objects in each unixuser hash chain. add the missing braces

Change-Id: I001b55f0d43639124b06758095664a31e8230db6
Reviewed-on: http://gerrit.openafs.org/11094
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: D Brashear <shadow@your-file-system.com>