net: move make_writable helper into common code
note that skb_make_writable already exists in net/netfilter/core.c but does something slightly different. Suggested-by: NEric Dumazet <eric.dumazet@gmail.com> Signed-off-by: NJiri Pirko <jiri@resnulli.us> Acked-by: NPravin B Shelar <pshelar@nicira.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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