rcu: Eliminate unused rcu_init_one() argument

Now that the rcu_state structure's ->rda field is compile-time initialized,
there is no need to pass the per-CPU rcu_data structure into rcu_init_one().
This commit therefore eliminates this now-unused parameter.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index e6da888..fccef5d 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -777,7 +777,7 @@
  */
 static void __init __rcu_init_preempt(void)
 {
-	rcu_init_one(rcu_state_p, rcu_data_p);
+	rcu_init_one(rcu_state_p);
 }
 
 /*