[PATCH] of: Add stub for of_get_next_parent()

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

Fixes a compiler error:

drivers/phy/phy-core.c: In function ‘__of_phy_provider_register’:
drivers/phy/phy-core.c:848:13: error: implicit declaration of function
‘of_get_next_parent’ [-Werror=implicit-function-declaration]
    parent = of_get_next_parent(parent);
                 ^

Fixes: 2f7600bc981c ("phy: core: Allow children node to be overridden")
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 include/linux/of.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/of.h b/include/linux/of.h
index c7292e8..00ab231 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -468,6 +468,12 @@ static inline struct device_node *of_get_parent(const struct device_node *node)
 	return NULL;
 }
 
+static inline struct device_node *of_get_next_parent(
+	const struct device_node *node)
+{
+	return NULL;
+}
+
 static inline struct device_node *of_get_next_child(
 	const struct device_node *node, struct device_node *prev)
 {
-- 
2.8.0.rc3