Sparseify MIPS.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/i8259.c b/arch/mips/kernel/i8259.c
index bb31370..a7d2aac 100644
--- a/arch/mips/kernel/i8259.c
+++ b/arch/mips/kernel/i8259.c
@@ -321,7 +321,7 @@
 
 	for (i = 0; i < 16; i++) {
 		irq_desc[i].status = IRQ_DISABLED;
-		irq_desc[i].action = 0;
+		irq_desc[i].action = NULL;
 		irq_desc[i].depth = 1;
 		irq_desc[i].handler = &i8259A_irq_type;
 	}