[NET]: Restore sanity wrt. print_mac().
MAC_FMT had only one user and we tried to get rid of that, but this created more problems than it solved. As a result, this reverts three commits: 235365f3 ("net/8021q/vlan_dev.c: Use print_mac."), fea5fa87 ("[NET]: Remove MAC_FMT"), and 8f789c48 ("[NET]: Elminate spurious print_mac() calls.") Signed-off-by: David S. Miller <email@example.com>
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