vsys: Avoid uninitialised variable warning

Initialise the parms array to 0 so that we don't get warnings from
the compiler when we call syscall() using it.

Caught by coverity (#985949)

Reviewed-on: http://gerrit.openafs.org/9395
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit a666bfd67bd14028aac5eb49f1bf02576fb58405)

Change-Id: Ia777a33c1332fe9a1f00cc56be3980f0d50b69ea
Reviewed-on: http://gerrit.openafs.org/11044
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>