rcu: Use false for return in __call_rcu_nocb()

Return false instead of 0 in __call_rcu_nocb() as this has bool as
return type.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Paul Gortmaker <paul.gortmaker@windriver.com>

kernel/rcu/tree_plugin.h

@@ -2574,7 +2574,7 @@ static void rcu_init_one_nocb(struct rcu_node *rnp)
 static bool __call_rcu_nocb(struct rcu_data *rdp, struct rcu_head *rhp,
 			    bool lazy, unsigned long flags)
 {
-	return 0;
+	return false;
 }
 
 static bool __maybe_unused rcu_nocb_adopt_orphan_cbs(struct rcu_state *rsp,