media: atomisp: Simplify atomisp_s_input() input argument checking

Simplify the checking of the input argument to atomisp_s_input():
- Remove the check for input >= ATOM_ISP_MAX_INPUTS, input_cnt
  never is > ATOM_ISP_MAX_INPUTS so checking only that is sufficient
- Remove the unnecessary camera local variable
- Move the 2 invalid argument checks to above the atomisp_pipe_check()
  which checks if the pipe is busy or not
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_ioctl.c

@@ -449,23 +449,17 @@ static int atomisp_s_input(struct file *file, void *fh, unsigned int input)
 	struct video_device *vdev = video_devdata(file);
 	struct atomisp_device *isp = video_get_drvdata(vdev);
 	struct atomisp_video_pipe *pipe = atomisp_to_video_pipe(vdev);
-	struct v4l2_subdev *camera = NULL;
 	int ret;
 
-	ret = atomisp_pipe_check(pipe, true);
-	if (ret)
-		return ret;
-
-	if (input >= ATOM_ISP_MAX_INPUTS || input >= isp->input_cnt) {
-		dev_dbg(isp->dev, "input_cnt: %d\n", isp->input_cnt);
+	if (input >= isp->input_cnt)
 		return -EINVAL;
-	}
 
-	camera = isp->inputs[input].camera;
-	if (!camera) {
-		dev_err(isp->dev, "%s, no camera\n", __func__);
+	if (!isp->inputs[input].camera)
 		return -EINVAL;
-	}
+
+	ret = atomisp_pipe_check(pipe, true);
+	if (ret)
+		return ret;
 
 	return atomisp_select_input(isp, input);
 }