of/i2c: call i2c_verify_client from of_find_i2c_device_by_node

i2c_bus_type may contain both I2C clients and I2C adapters. Fix
of_find_i2c_device_by_node to call i2c_verify_client to ensure that it
only returns non-NULL of I2C clients.
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Acked-by: NRob Herring <rob.herring@calxeda.com>
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>

drivers/of/of_i2c.c

@@ -90,7 +90,7 @@ struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
 	if (!dev)
 		return NULL;
 
-	return to_i2c_client(dev);
+	return i2c_verify_client(dev);
 }
 EXPORT_SYMBOL(of_find_i2c_device_by_node);