net: hsr: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: Arvid Brodin <arvid.brodin@alten.se>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c
index 284a9b8..286ceb4 100644
--- a/net/hsr/hsr_framereg.c
+++ b/net/hsr/hsr_framereg.c
@@ -365,16 +365,14 @@ static struct hsr_port *get_late_port(struct hsr_priv *hsr,
 /* Remove stale sequence_nr records. Called by timer every
  * HSR_LIFE_CHECK_INTERVAL (two seconds or so).
  */
-void hsr_prune_nodes(unsigned long data)
+void hsr_prune_nodes(struct timer_list *t)
 {
-	struct hsr_priv *hsr;
+	struct hsr_priv *hsr = from_timer(hsr, t, prune_timer);
 	struct hsr_node *node;
 	struct hsr_port *port;
 	unsigned long timestamp;
 	unsigned long time_a, time_b;
 
-	hsr = (struct hsr_priv *) data;
-
 	rcu_read_lock();
 	list_for_each_entry_rcu(node, &hsr->node_db, mac_list) {
 		/* Shorthand */