Removed list_size struct member from kernel space list implementation

Removed the list_size struct member as it was only used in a single assertion,
as mentioned in PR openzfs#15478.

Signed-off-by: MigeljanImeri <imerimigel@gmail.com>

include/os/freebsd/spl/sys/list_impl.h

@@ -39,7 +39,6 @@ struct list_node {
 };
 
 struct list {
-	size_t	list_size;
 	size_t	list_offset;
 	struct list_node list_head;
 };

include/os/linux/spl/sys/list.h

@@ -48,7 +48,6 @@
 typedef struct list_head list_node_t;
 
 typedef struct list {
-	size_t list_size;
 	size_t list_offset;
 	list_node_t list_head;
 } list_t;
@@ -72,7 +71,8 @@ list_link_init(list_node_t *node)
 static inline void
 list_create(list_t *list, size_t size, size_t offset)
 {
-	list->list_size = size;
+	(void) size;
+
 	list->list_offset = offset;
 	INIT_LIST_HEAD(&list->list_head);
 }

module/os/freebsd/spl/list.c

@@ -62,9 +62,9 @@ void
 list_create(list_t *list, size_t size, size_t offset)
 {
 	ASSERT3P(list, !=, NULL);
-	ASSERT3U(size, >=, offset + sizeof (list_node_t));
 
-	list->list_size = size;
+	(void) size;
+
 	list->list_offset = offset;
 	list->list_head.list_next = list->list_head.list_prev =
 	    &list->list_head;
@@ -194,7 +194,6 @@ list_move_tail(list_t *dst, list_t *src)
 	list_node_t *dstnode = &dst->list_head;
 	list_node_t *srcnode = &src->list_head;
 
-	ASSERT3U(dst->list_size, ==, src->list_size);
 	ASSERT3U(dst->list_offset, ==, src->list_offset);
 
 	if (list_empty(src))