LU-6215 osc: use list_for_each_entry_safe() when delete items

LU-6215 osc: use list_for_each_entry_safe() when delete items

Since we will remove items off the list using list_del_init() we need
to use a safe version of the list_for_each_entry() macro aptly named
list_for_each_entry_safe().

Linux-commit: f13ab92effb94c8fc5eade75f6f246facd7ef5be

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I6ec6d8073da6e0aa45e9d8a6ee7cde84ed9cab07
Reviewed-on: http://review.whamcloud.com/13956
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>