[POWERPC] arch/powerpc/sysdev/mpic.c of_node_get cleanup

No need for ?: because of_node_get() can handle NULL argument.
Signed-off-by: NMariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/sysdev/mpic.c

@@ -912,7 +912,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
 	
 	memset(mpic, 0, sizeof(struct mpic));
 	mpic->name = name;
-	mpic->of_node = node ? of_node_get(node) : NULL;
+	mpic->of_node = of_node_get(node);
 
 	mpic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 256,
 				       &mpic_host_ops,