LU-19059 lov: fix lov_stripe_set

LU-19059 lov: fix lov_stripe_set

Prevent overflow on multiplication of 32 bit integers.

Test to illustrate the issue is added to hit overflow in both branches
of lov_stripe_set().

Fixes: 6eee4ea5b6 ("LU-6174 lov: use standard Linux 64 divison macros")
HPE-bug-id: LUS-12782
Signed-off-by: Vladimir Saveliev <vladimir.saveliev@hpe.com>
Change-Id: If5a5aaf8de98c79b3df908e0d052461a3c8d0989
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/59436
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alexey Lyashkov <alexey.lyashkov@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>