media: imx274: slightly simplify code

imx274_s_frame_interval() already has a direct pointer to the v4l2
exposure control, so reuse it to simplify code.
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/i2c/imx274.c

@@ -984,7 +984,7 @@ static int imx274_s_frame_interval(struct v4l2_subdev *sd,
 		}
 
 		/* update exposure time accordingly */
-		imx274_set_exposure(imx274, imx274->ctrls.exposure->val);
+		imx274_set_exposure(imx274, ctrl->val);
 
 		dev_dbg(&imx274->client->dev, "set frame interval to %uus\n",
 			fi->interval.numerator * 1000000