libadmin: Fix a lot of dead assignments in vsprocs

Tidy up a lot of places where we initialise a variable, then
immediately assign a proper value to it, or store a return value
that we don't actually care about.

Caught by clang-analyzer

Reviewed-on: http://gerrit.openafs.org/9205
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit ee0d57bb488e9fd74b46547273904a9821e20c57)

Change-Id: I60f690336bc449f481a5be542ab7369d6e04f4b6
Reviewed-on: http://gerrit.openafs.org/11009
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>