eCryptfs: fix to use list_for_each_entry_safe() when delete items

Since we will be removing items off the list using list_del() we need
to use a safer version of the list_for_each_entry() macro aptly named
list_for_each_entry_safe(). We should use the safe macro if the loop
involves deletions of items.
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
[tyhicks: Fixed compiler err - missing list_for_each_entry_safe() param]
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>

fs/ecryptfs/kthread.c

@@ -102,12 +102,12 @@ int __init ecryptfs_init_kthread(void)
 
 void ecryptfs_destroy_kthread(void)
 {
-	struct ecryptfs_open_req *req;
+	struct ecryptfs_open_req *req, *tmp;
 
 	mutex_lock(&ecryptfs_kthread_ctl.mux);
 	ecryptfs_kthread_ctl.flags |= ECRYPTFS_KTHREAD_ZOMBIE;
-	list_for_each_entry(req, &ecryptfs_kthread_ctl.req_list,
-			    kthread_ctl_list) {
+	list_for_each_entry_safe(req, tmp, &ecryptfs_kthread_ctl.req_list,
+				 kthread_ctl_list) {
 		list_del(&req->kthread_ctl_list);
 		*req->lower_file = ERR_PTR(-EIO);
 		complete(&req->done);