LU-6142 lov: use list_for_each_entry in lov_obd.c

LU-6142 lov: use list_for_each_entry in lov_obd.c

Using the *_entry macro simplifies the code slightly.

Change-Id: Ia50cd2cbaf9bac6c9873ef4af7e5cbfa2c8e660e
Signed-off-by: Mr. NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/49740
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>