bus/arm-cci: Streamline devicetree handling a bit

Rather than iterating over child nodes explicitly testing for
availability, we can just use the other helper which already subsumes
that check. Also, the availability check is already NULL-safe, so get
rid of a redundant check in cci_probe(), too.

Acked-by: Punit Agrawal <[e-mail]>
Acked-by: Will Deacon <[e-mail]>
Signed-off-by: Robin Murphy <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

drivers/bus/arm-cci.c

···
 	if (!ports)
 		return -ENOMEM;
 
-	for_each_child_of_node(np, cp) {
+	for_each_available_child_of_node(np, cp) {
 		if (!of_match_node(arm_cci_ctrl_if_matches, cp))
-			continue;
-
-		if (!of_device_is_available(cp))
 			continue;
 
 		i = nb_ace + nb_ace_lite;
···
 	struct resource res;
 
 	np = of_find_matching_node(NULL, arm_cci_matches);
-	if(!np || !of_device_is_available(np))
+	if (!of_device_is_available(np))
 		return -ENODEV;
 
 	ret = of_address_to_resource(np, 0, &res);