posix-timers: Remove unused variable

Remove the unused variable *node introduced by commit 5ed67f05 (posix
timers: Allocate timer id per process)
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Pavel Emelyanov <xemul@parallels.com>

kernel/posix-timers.c

@@ -154,7 +154,6 @@ static struct k_itimer *__posix_timers_find(struct hlist_head *head,
 					    struct signal_struct *sig,
 					    timer_t id)
 {
-	struct hlist_node *node;
 	struct k_itimer *timer;
 
 	hlist_for_each_entry_rcu(timer, head, t_hash) {