i2c: mux: pca954x: simplify code to reach the adapter

struct i2c_client has a direct pointer to the adapter, no need to dig
it out of the struct device tree.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Peter Rosin <peda@axentia.se>

drivers/i2c/muxes/i2c-mux-pca954x.c

@@ -347,7 +347,7 @@ static void pca954x_cleanup(struct i2c_mux_core *muxc)
 static int pca954x_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
-	struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent);
+	struct i2c_adapter *adap = client->adapter;
 	struct pca954x_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct device *dev = &client->dev;
 	struct device_node *np = dev->of_node;