media: pxa_camera: disable and unprepare the clock source on error

pxa_camera_probe() was not calling pxa_camera_deactivate(),
responsible to call clk_disable_unprepare(), on the failure path. This
was leading to unbalancing source clock.

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/pxa_camera.c

@@ -2491,7 +2491,7 @@ static int pxa_camera_probe(struct platform_device *pdev)
 	dev_set_drvdata(&pdev->dev, pcdev);
 	err = v4l2_device_register(&pdev->dev, &pcdev->v4l2_dev);
 	if (err)
-		goto exit_free_dma;
+		goto exit_deactivate;
 
 	pcdev->asds[0] = &pcdev->asd;
 	pcdev->notifier.subdevs = pcdev->asds;
@@ -2527,6 +2527,8 @@ static int pxa_camera_probe(struct platform_device *pdev)
 	v4l2_clk_unregister(pcdev->mclk_clk);
 exit_free_v4l2dev:
 	v4l2_device_unregister(&pcdev->v4l2_dev);
+exit_deactivate:
+	pxa_camera_deactivate(pcdev);
 exit_free_dma:
 	dma_release_channel(pcdev->dma_chans[2]);
 exit_free_dma_u: