vfio/platform: fix module_put call in error flow

stable inclusion
from linux-4.19.194
commit 2bd07ebcb949b17a431aacd0e99fa4558c4a5600

--------------------------------

[ Upstream commit dc51ff91 ]

The ->parent_module is the one that use in try_module_get. It should
also be the one the we use in module_put during vfio_platform_open().

Fixes: 32a2d71c ("vfio: platform: introduce vfio-platform-base module")
Signed-off-by: NMax Gurtovoy <mgurtovoy@nvidia.com>
Message-Id: <20210518192133.59195-1-mgurtovoy@nvidia.com>
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/vfio/platform/vfio_platform_common.c

@@ -296,7 +296,7 @@ static int vfio_platform_open(void *device_data)
 	vfio_platform_regions_cleanup(vdev);
 err_reg:
 	mutex_unlock(&driver_lock);
-	module_put(THIS_MODULE);
+	module_put(vdev->parent_module);
 	return ret;
 }