media: imx: imx7_mipi_csis: Runtime suspend in .s_stream() error path

If the .s_stream() handler fails after calling pm_runtime_get_sync(),
call pm_runtime_put() in the error path.

While at it add a few blank lines to make the code more readable.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/imx/imx7-mipi-csis.c

@@ -694,6 +694,7 @@ static int mipi_csis_s_stream(struct v4l2_subdev *mipi_sd, int enable)
 			return ret;
 
 		mipi_csis_clear_counters(state);
+
 		ret = pm_runtime_get_sync(&state->pdev->dev);
 		if (ret < 0) {
 			pm_runtime_put_noidle(&state->pdev->dev);
@@ -701,10 +702,11 @@ static int mipi_csis_s_stream(struct v4l2_subdev *mipi_sd, int enable)
 		}
 		ret = v4l2_subdev_call(state->src_sd, core, s_power, 1);
 		if (ret < 0 && ret != -ENOIOCTLCMD)
-			return ret;
+			goto done;
 	}
 
 	mutex_lock(&state->lock);
+
 	if (enable) {
 		if (state->flags & ST_SUSPENDED) {
 			ret = -EBUSY;
@@ -732,7 +734,9 @@ static int mipi_csis_s_stream(struct v4l2_subdev *mipi_sd, int enable)
 
 unlock:
 	mutex_unlock(&state->lock);
-	if (!enable)
+
+done:
+	if (!enable || ret < 0)
 		pm_runtime_put(&state->pdev->dev);
 
 	return ret;