s390-virtio: Check for NULL device in reset hypercall
s390_virtio_bus_find_mem() may return a NULL VirtIOS390Device. If called with, e.g., args[0] == 0, this leads to a segfault. Fix this by adding error handling as done for other hypercalls. Present since baf0b55a (Implement virtio reset). Signed-off-by: NAndreas Färber <afaerber@suse.de> Signed-off-by: NAlexander Graf <agraf@suse.de>
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