crypto/pcrypt: Replace synchronize_rcu_bh() with synchronize_rcu()

Now that synchronize_rcu() waits for bh-disable regions of code as
well as RCU read-side critical sections, the synchronize_rcu_bh() in
pcrypt_cpumask_change_notify() can be replaced by synchronize_rcu().
This commit therefore makes this change.
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: <linux-crypto@vger.kernel.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/pcrypt.c

@@ -382,7 +382,7 @@ static int pcrypt_cpumask_change_notify(struct notifier_block *self,
 
 	cpumask_copy(new_mask->mask, cpumask->cbcpu);
 	rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
-	synchronize_rcu_bh();
+	synchronize_rcu();
 
 	free_cpumask_var(old_mask->mask);
 	kfree(old_mask);