LU-18153 osd: don't release uninitialized SA

LU-18153 osd: don't release uninitialized SA

if osd-zfs's object has no initialized SA, then do not
try to release that.

Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I210ae1eb9cae0bfb02161efeee2f897d9c37294b
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/57989
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Timothy Day <timday@amazon.com>