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Revert r286880: If at first this change made sense, it turns out

Description

Revert r286880: If at first this change made sense, it turns out
it helps only the TCP timers callout(9) usage. As the benefit for
others callout(9) usages did not reach a consensus the historical
usage should prevail.

Differential Revision: https://reviews.freebsd.org/D3078