s3: smbd: Now we're using OpenDir_fsp() all the time, make sure we don't leak file...

s3: smbd: Now we're using OpenDir_fsp() all the time, make sure we don't leak file handles.

We must always set dir_hnd->fsp, even in the fallback to
SMB_VFS_OPENDIR() case. Remember if we had to fall back
and fix the destructor to close the additional file
descriptor if we did.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>