powerpc/cell: Switch to irq_get_nr_irqs()

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

Signed-off-by: Bart Van Assche <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Michael Ellerman <[email protected]> (powerpc)
Link: https://lore.kernel.org/all/[email protected]

Author: bvanassche

arch/powerpc/platforms/cell/axon_msi.c

@@ -112,7 +112,7 @@ static void axon_msi_cascade(struct irq_desc *desc)
 		pr_devel("axon_msi: woff %x roff %x msi %x\n",
 			  write_offset, msic->read_offset, msi);
 
-		if (msi < nr_irqs && irq_get_chip_data(msi) == msic) {
+		if (msi < irq_get_nr_irqs() && irq_get_chip_data(msi) == msic) {
 			generic_handle_irq(msi);
 			msic->fifo_virt[idx] = cpu_to_le32(0xffffffff);
 		} else {