LU-12678 o2iblnd: Use list_for_each_entry_safe

LU-12678 o2iblnd: Use list_for_each_entry_safe

Several loops use list_for_each_safe(), then call
list_entry() as first step.
These can be merged using list_for_each_entry_safe().

Test-Parameters: trivial testlist=sanity-lnet
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I01ba77b98bd4863fa37cbbe6b4072ac2513e5821
Reviewed-on: https://review.whamcloud.com/39126
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>