LU-12690 llite: error handling of ll_och_fill()

LU-12690 llite: error handling of ll_och_fill()

The return error of ll_och_fill() should be handled.

Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: I4e750001cb124104836fa24e39ec8ae203b51a83
Reviewed-on: https://review.whamcloud.com/35913
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>