LU-15014 osc: Fix possible null pointer

LU-15014 osc: Fix possible null pointer

Change init to fix possible null pointer access.

Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: Id1bee8b5ea5fb92a8831992ad44c487c69d52e1e
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/44975
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>