net: sock: Use USEC_PER_SEC macro instead of literal 1000000
The USEC_PER_SEC is used once in sock_set_timeout as the max value of tv_usec. But there are other similar codes which use the literal 1000000 in this file. It is minor cleanup to keep consitent. Signed-off-by: NGao Feng <fgao@ikuai8.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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