virtio: return ENOMEM on out of memory
add_buf returns ring size on out of memory, this is not what devices expect. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: stable@kernel.org # .34.x
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