[NET]: Clean proto_(un)register from in-code ifdefs
The struct proto has the per-cpu "inuse" counter, which is handled with a special care. All the handling code hides under the ifdef CONFIG_SMP and it introduces some code duplication and makes it look worse than it could. Clean this. Signed-off-by: NPavel Emelyanov <xemul@openvz.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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