tcp: Fix tcp_mark_head_lost() with packets == 0
A packet is marked as lost in case packets == 0, although nothing should be done. This results in a too early retransmitted packet during recovery in some cases. This small patch fixes this issue by returning immediately. Signed-off-by: NLennart Schulte <lennart.schulte@nets.rwth-aachen.de> Signed-off-by: NArnd Hannemann <hannemann@nets.rwth-aachen.de> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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