VSOCK: Only check error on skb_recv_datagram when skb is NULL
If skb_recv_datagram returns an skb, we should ignore the err value returned. Otherwise, datagram receives will return EAGAIN when they have to wait for a datagram. Acked-by: NAdit Ranadive <aditr@vmware.com> Signed-off-by: NJorgen Hansen <jhansen@vmware.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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