kernel/kexec_core.c: use list_for_each_entry_safe in kimage_free_page_list

Use list_for_each_entry_safe() instead of list_for_each_safe() to
simplify the code.
Signed-off-by: Geliang Tang <geliangtang@163.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/kexec_core.c

@@ -310,12 +310,9 @@ static void kimage_free_pages(struct page *page)
 
 void kimage_free_page_list(struct list_head *list)
 {
-	struct list_head *pos, *next;
+	struct page *page, *next;
 
-	list_for_each_safe(pos, next, list) {
-		struct page *page;
-
-		page = list_entry(pos, struct page, lru);
+	list_for_each_entry_safe(page, next, list, lru) {
 		list_del(&page->lru);
 		kimage_free_pages(page);
 	}