LU-13195 osp: invalidate object on write error

do this unconditionally, to avoid cases when the object is
on another request's invalidation list.

Lustre-change: https://review.whamcloud.com/38387
Lustre-commit: 9e1071b517578ed3752efb1412017c8f93cd333b

Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I8ee0c484e695e88c0ea6fb13ac377fa689150780
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/46863
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>