virtio: console: fix error handling in init() function
If register_virtio_driver() fails, virtio-ports class is not destroyed. The patch adds error handling of register_virtio_driver(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: NAlexey Khoroshilov <khoroshilov@ispras.ru> Acked-by: NAmit Shah <amit.shah@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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