driver core: Let dev_of_node() accept a NULL dev

We'd like to chain this in places where the 'dev' argument might be
NULL. Let this function take a NULL 'dev' so this can work.

Cc: Miquel Raynal <[email protected]>
Cc: Jerome Brunet <[email protected]>
Cc: Russell King <[email protected]>
Cc: Michael Turquette <[email protected]>
Cc: Jeffrey Hugo <[email protected]>
Cc: Chen-Yu Tsai <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Rob Herring <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Tested-by: Jeffrey Hugo <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
diff --git a/include/linux/device.h b/include/linux/device.h
index b425a7e..0370dd0 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1231,7 +1231,7 @@ static inline void device_lock_assert(struct device *dev)
 
 static inline struct device_node *dev_of_node(struct device *dev)
 {
-	if (!IS_ENABLED(CONFIG_OF))
+	if (!IS_ENABLED(CONFIG_OF) || !dev)
 		return NULL;
 	return dev->of_node;
 }