staging: lustre: lnet: conrpc: Use list_for_each_entry_safe

Doubly linked lists which are  iterated  using list_empty
and list_entry macros have been replaced with list_for_each_entry_safe
macro.
This makes the iteration simpler and more readable.

This patch replaces the while loop containing list_empty and list_entry
with list_for_each_entry_safe.

This was done with Coccinelle.

@@
expression E1;
identifier I1, I2;
type T;
iterator name list_for_each_entry_safe;
@@

T *I1;
+ T *tmp;
...
- while (list_empty(&E1) == 0)
+ list_for_each_entry_safe (I1, tmp, &E1, I2)
{
...when != T *I1;
- I1 = list_entry(E1.next, T, I2);
...
}

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lnet/selftest/conrpc.c

@@ -1335,6 +1335,7 @@ lstcon_rpc_cleanup_wait(void)
 {
 	lstcon_rpc_trans_t *trans;
 	lstcon_rpc_t *crpc;
+	lstcon_rpc_t *temp;
 	struct list_head *pacer;
 	struct list_head zlist;
 
@@ -1374,9 +1375,7 @@ lstcon_rpc_cleanup_wait(void)
 
 	spin_unlock(&console_session.ses_rpc_lock);
 
-	while (!list_empty(&zlist)) {
-		crpc = list_entry(zlist.next, lstcon_rpc_t, crp_link);
-
+	list_for_each_entry_safe(crpc, temp, &zlist, crp_link) {
 		list_del(&crpc->crp_link);
 		LIBCFS_FREE(crpc, sizeof(lstcon_rpc_t));
 	}