gpu: drm: nouveau: Use list_{next/prev}_entry instead of list_entry

It's better to use list_entry instead of list_{next/prev}_entry
as it makes the code more clear to read.
This patch replace list_entry with list_{next/prev}_entry.

Signed-off-by: Arushi Singhal <arushisinghal19971997@gmail.com>
Acked-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1522000893-5331-3-git-send-email-arushisinghal19971997@gmail.com

drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c

@@ -134,7 +134,7 @@ nvkm_cstate_find_best(struct nvkm_clk *clk, struct nvkm_pstate *pstate,
 			       nvkm_volt_map(volt, volt->max2_id, clk->temp));
 
 	for (cstate = start; &cstate->head != &pstate->list;
-	     cstate = list_entry(cstate->head.prev, typeof(*cstate), head)) {
+	     cstate = list_prev_entry(cstate, head)) {
 		if (nvkm_cstate_valid(clk, cstate, max_volt, clk->temp))
 			break;
 	}