Windows: Defer deref of a directoryEntry

Windows:  Defer deref of a directoryEntry

During the handling of SL_OPEN_TARGET opens (usually associated
with a rename) a directory entry was deferenced prior to its
contents being used (to set up a seconding inforation field).

This change just holds on to the reference until after that processing.

Change-Id: I26dbd4bfb6595863109e549893f2367f71ad6404
Reviewed-on: http://gerrit.openafs.org/5651
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>