media: atomisp: Fix v4l2_fh resource leak on open errors

When atomisp_open() fails then it must call v4l2_fh_release() to undo
the results of v4l2_fh_open().
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

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

@@ -804,6 +804,7 @@ static int atomisp_open(struct file *file)
 	pm_runtime_put(vdev->v4l2_dev->dev);
 error:
 	rt_mutex_unlock(&isp->mutex);
+	v4l2_fh_release(file);
 	return ret;
 }