powerpc/pseries/pmem: Convert to %pOFn instead of device_node.name

In preparation to remove the node name pointer from struct
device_node, convert printf users to use the %pOFn format specifier.
pmem.c was recently added and missed the initial conversion.
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/pseries/pmem.c

@@ -52,8 +52,8 @@ static ssize_t pmem_drc_add_node(u32 drc_index)
 	/* NB: The of reconfig notifier creates platform device from the node */
 	rc = dlpar_attach_node(dn, pmem_node);
 	if (rc) {
-		pr_err("Failed to attach node %s, rc: %d, drc index: %x\n",
-			dn->name, rc, drc_index);
+		pr_err("Failed to attach node %pOF, rc: %d, drc index: %x\n",
+			dn, rc, drc_index);
 
 		if (dlpar_release_drc(drc_index))
 			dlpar_free_cc_nodes(dn);
@@ -93,8 +93,8 @@ static ssize_t pmem_drc_remove_node(u32 drc_index)
 
 	rc = dlpar_release_drc(drc_index);
 	if (rc) {
-		pr_err("Failed to release drc (%x) for CPU %s, rc: %d\n",
-			drc_index, dn->name, rc);
+		pr_err("Failed to release drc (%x) for CPU %pOFn, rc: %d\n",
+			drc_index, dn, rc);
 		dlpar_attach_node(dn, pmem_node);
 		return rc;
 	}