genirq: Fix wrong name in request_percpu_nmi() description

ready_percpu_nmi() was the previous name of prepare_percpu_nmi(). Update
request_percpu_nmi() comment with the correct function name.
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Reported-by: Li Wei <liwei391@huawei.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

kernel/irq/manage.c

@@ -2427,8 +2427,8 @@ EXPORT_SYMBOL_GPL(__request_percpu_irq);
  *	@dev_id: A percpu cookie passed back to the handler function
  *
  *	This call allocates interrupt resources for a per CPU NMI. Per CPU NMIs
- *	have to be setup on each CPU by calling ready_percpu_nmi() before being
- *	enabled on the same CPU by using enable_percpu_nmi().
+ *	have to be setup on each CPU by calling prepare_percpu_nmi() before
+ *	being enabled on the same CPU by using enable_percpu_nmi().
  *
  *	Dev_id must be globally unique. It is a per-cpu variable, and
  *	the handler gets called with the interrupted CPU's instance of