Eric W. Biederman 8a4bff714f tcp_metrics: Remove the unused return code from tcp_metrics_flush_all
tcp_metrics_flush_all always returns 0.  Remove the unnecessary return code.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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