vol: Don't always FDH_REALLYCLOSE on linktable ops

vol: Don't always FDH_REALLYCLOSE on linktable ops

If we dec a linktable entry or get a free tag from the link table,
there is no reason to FDH_REALLYCLOSE the linktable fd handle.
FDH_REALLYCLOSE is the same as FDH_CLOSE, except that it tells the
ihandle package that the file handle will not be used again soon. If
we dec a linktable entry or get a free tag, there is no reason to
think that, so just FDH_CLOSE the handle instead.

Reviewed-on: http://gerrit.openafs.org/4903
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 78e39417af6d2b87f0cbda0b5d3bb3e4859dc0ba)

Change-Id: I28f5abee59265403362f3f1472a9fa21a52597c0
Reviewed-on: http://gerrit.openafs.org/4949
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>