[VLAN]: Avoid expensive divides
We can avoid divides (as seen with CONFIG_CC_OPTIMIZE_FOR_SIZE=y on x86) changing vlan_group_get_device()/vlan_group_set_device() id parameter from signed to unsigned. Signed-off-by: NEric Dumazet <dada1@cosmosbay.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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