LU-14911 osp: release thandle if it was created

LU-14911 osp: release thandle if it was created

osp_statfs_update() could leak thandle if transaction couldn't
start for a reason.

Lustre-change:  https://review.whamcloud.com/44504
Lustre-commit: c807e3f33b39409a061fa997cac57ac394c503ba

Change-Id: I541a5e4a7860008eb179d905ac57997b737f178c
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/54670
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>