powerpc: Use proper accessors for IRQ_* flags

Use the proper accessors instead of open access to irq_desc.
Converted with coccinelle.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/powerpc/sysdev/cpm2_pic.c b/arch/powerpc/sysdev/cpm2_pic.c
index 4730325..8ffe164 100644
--- a/arch/powerpc/sysdev/cpm2_pic.c
+++ b/arch/powerpc/sysdev/cpm2_pic.c
@@ -226,7 +226,7 @@
 {
 	pr_debug("cpm2_pic_host_map(%d, 0x%lx)\n", virq, hw);
 
-	irq_to_desc(virq)->status |= IRQ_LEVEL;
+	irq_set_status_flags(virq, IRQ_LEVEL);
 	set_irq_chip_and_handler(virq, &cpm2_pic, handle_level_irq);
 	return 0;
 }