net/tipc: Remove unused struct distr_queue_item

After commit 09b5678c("tipc: remove dead code in tipc_net and relatives"),
struct distr_queue_item is not used any more and can be removed as well.
Signed-off-by: Yuan Can <yuancan@huawei.com>
Acked-by: Jon Maloy <jmaloy@redhat.com>
Link: https://lore.kernel.org/r/20220928085636.71749-1-yuancan@huawei.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/tipc/name_distr.c

@@ -41,14 +41,6 @@
 
 int sysctl_tipc_named_timeout __read_mostly = 2000;
 
-struct distr_queue_item {
-	struct distr_item i;
-	u32 dtype;
-	u32 node;
-	unsigned long expires;
-	struct list_head next;
-};
-
 /**
  * publ_to_item - add publication info to a publication message
  * @p: publication info