supervdsmServer: Remove needless parentheses

Change-Id: I001b560587191648855356232bc18220d2d87b9c
Signed-off-by: Ondřej Svoboda <osvoboda@redhat.com>
Amends: http://gerrit.ovirt.org/35311
Reviewed-on: http://gerrit.ovirt.org/36075
Reviewed-by: Dan Kenigsberg <danken@redhat.com>