Use the irq_get_nr_irqs() function instead of the global variable
'nr_irqs'. This patch prepares for changing 'nr_irqs' from an exported
global variable into a variable with file scope.

Cc: Thomas Sailer <t.sailer@alumni.ethz.ch>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/net/hamradio/baycom_ser_fdx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/hamradio/baycom_ser_fdx.c b/drivers/net/hamradio/baycom_ser_fdx.c
index 646f605e358f..799f8ece7824 100644
--- a/drivers/net/hamradio/baycom_ser_fdx.c
+++ b/drivers/net/hamradio/baycom_ser_fdx.c
@@ -373,6 +373,7 @@ static enum uart ser12_check_uart(unsigned int iobase)
 
 static int ser12_open(struct net_device *dev)
 {
+	const unsigned int nr_irqs = irq_get_nr_irqs();
 	struct baycom_state *bc = netdev_priv(dev);
 	enum uart u;