DAFS: Do not give back vol to viced after salvage

DAFS: Do not give back vol to viced after salvage

If we VRequestSalvage_r a volume successfully, and we are not the
fileserver, we will tell the fileserver to salvage a volume. So, we do
not need to give back the volume afterwards, since telling the
fileserver that a volume needs a salvage effectively gives it back (so
the salvager can take it).

So, clear needsPutBack so we don't try to also give back the volume,
and avoid the fileserver yelling at us for trying to give back a
volume that is checked out by someone else (or is not checked out at
all).

Reviewed-on: http://gerrit.openafs.org/4445
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit 316b0421a27a4a76298f60ecd62b1236c971e512)

Change-Id: I432abb4d65a738e0e1936a7ff2fff2eccf45834a
Reviewed-on: http://gerrit.openafs.org/6284
Tested-by: Derrick Brashear <shadow@dementix.org>
Reviewed-by: Derrick Brashear <shadow@dementix.org>