man 7 socket SO_INCOMING_CPU example typo

["Salminen, Tomi" <tsalminen@xxxxxxxxxxxxxx>]

Hi.

Me and Tommi Linnakangas at work noticed that there's a bug-inducing typo in the
man 7 socket entry for SO_INCOMING_CPU:

                  int cpu = 1;
                  socklen_t len = sizeof(cpu);
                  setsockopt(fd, SOL_SOCKET, SO_INCOMING_CPU, &cpu, &len);

The len argument should not be a pointer to len, but value of len.

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