Windows: Pin write position prior to defer
If we extend the file prior to defrring the write *and* the write
is set up FILE_WRITE_TO_END_OF_FILE then we have to convert the
FILE_WRITE_TO_END_OF_FILE to an absolute position since we have
already moved the FCB->Header.FileSize.
Change-Id: Ibe1a5d616490a3db152818cbd6bb24d5af251c5f
Reviewed-on: http://gerrit.openafs.org/11069
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Rod Widdowson <rdw@steadingsoftware.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>