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/qe_lib/qe_ic.c b/arch/powerpc/sysdev/qe_lib/qe_ic.c
index 8c9ded8..6349a72 100644
--- a/arch/powerpc/sysdev/qe_lib/qe_ic.c
+++ b/arch/powerpc/sysdev/qe_lib/qe_ic.c
@@ -268,7 +268,7 @@
 	chip = &qe_ic->hc_irq;
 
 	set_irq_chip_data(virq, qe_ic);
-	irq_to_desc(virq)->status |= IRQ_LEVEL;
+	irq_set_status_flags(virq, IRQ_LEVEL);
 
 	set_irq_chip_and_handler(virq, chip, handle_level_irq);