net: factor out a helper to decrement the skb refcount
The same code is replicated in 3 different places; move it to a common helper. Signed-off-by: NPaolo Abeni <pabeni@redhat.com> Acked-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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