of: Always use 'struct device.of_node' to get device node pointer.

The following structure elements duplicate the information in
'struct device.of_node' and so are being eliminated.  This patch
makes all readers of these elements use device.of_node instead.

(struct of_device *)->node
(struct dev_archdata *)->prom_node (sparc)
(struct dev_archdata *)->of_node (powerpc & microblaze)

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/arch/powerpc/platforms/cell/axon_msi.c b/arch/powerpc/platforms/cell/axon_msi.c
index 8efe481..177a4f1 100644
--- a/arch/powerpc/platforms/cell/axon_msi.c
+++ b/arch/powerpc/platforms/cell/axon_msi.c
@@ -345,7 +345,7 @@
 static int axon_msi_probe(struct of_device *device,
 			  const struct of_device_id *device_id)
 {
-	struct device_node *dn = device->node;
+	struct device_node *dn = device->dev.of_node;
 	struct axon_msic *msic;
 	unsigned int virq;
 	int dcr_base, dcr_len;