media: i2c: adp1653: simplify getting state container

The pointer to 'struct v4l2_subdev' is stored in drvdata via
v4l2_i2c_subdev_init() so there is no point of a dance like:

    struct i2c_client *client = to_i2c_client(struct device *dev)
    struct v4l2_subdev *sd = i2c_get_clientdata(client);

This allows to remove local variable 'client' and few pointer
dereferences.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/adp1653.c

@@ -379,8 +379,7 @@ static const struct v4l2_subdev_internal_ops adp1653_internal_ops = {
 
 static int adp1653_suspend(struct device *dev)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
+	struct v4l2_subdev *subdev = dev_get_drvdata(dev);
 	struct adp1653_flash *flash = to_adp1653_flash(subdev);
 
 	if (!flash->power_count)
@@ -391,8 +390,7 @@ static int adp1653_suspend(struct device *dev)
 
 static int adp1653_resume(struct device *dev)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
+	struct v4l2_subdev *subdev = dev_get_drvdata(dev);
 	struct adp1653_flash *flash = to_adp1653_flash(subdev);
 
 	if (!flash->power_count)