vhost: correctly check the return value of translate_desc() in log_used()
When fail, translate_desc() returns negative value, otherwise the number of iovs. So we should fail when the return value is negative instead of a blindly check against zero. Detected by CoverityScan, CID# 1442593: Control flow issues (DEADCODE) Fixes: cc5e7107 ("vhost: log dirty page correctly") Acked-by: NMichael S. Tsirkin <mst@redhat.com> Reported-by: NStephen Hemminger <stephen@networkplumber.org> Signed-off-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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