staging: lustre: lnet: api-ni: 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/lnet/api-ni.c

@@ -1086,18 +1086,17 @@ lnet_clear_zombies_nis_locked(void)
 	int i;
 	int islo;
 	lnet_ni_t *ni;
+	lnet_ni_t *temp;
 
 	/*
 	 * Now wait for the NI's I just nuked to show up on ln_zombie_nis
 	 * and shut them down in guaranteed thread context
 	 */
 	i = 2;
-	while (!list_empty(&the_lnet.ln_nis_zombie)) {
+	list_for_each_entry_safe(ni, temp, &the_lnet.ln_nis_zombie, ni_list) {
 		int *ref;
 		int j;
 
-		ni = list_entry(the_lnet.ln_nis_zombie.next,
-				lnet_ni_t, ni_list);
 		list_del_init(&ni->ni_list);
 		cfs_percpt_for_each(ref, j, ni->ni_refs) {
 			if (!*ref)
@@ -1147,6 +1146,7 @@ static void
 lnet_shutdown_lndnis(void)
 {
 	lnet_ni_t *ni;
+	lnet_ni_t *temp;
 	int i;
 
 	/* NB called holding the global mutex */
@@ -1160,9 +1160,7 @@ lnet_shutdown_lndnis(void)
 	the_lnet.ln_shutdown = 1;	/* flag shutdown */
 
 	/* Unlink NIs from the global table */
-	while (!list_empty(&the_lnet.ln_nis)) {
-		ni = list_entry(the_lnet.ln_nis.next,
-				lnet_ni_t, ni_list);
+	list_for_each_entry_safe(ni, temp, &the_lnet.ln_nis, ni_list) {
 		lnet_ni_unlink_locked(ni);
 	}