dmiller ff7a0ea10d Avoid runtime undefinedness due to integer overflow ...

Using TIMEVAL_MSEC_SUBTRACT can lead to integer overflow when the times
are far apart (such as epoch (0) or uninitialized timeval and "now").
Instead, calculate the "deadline" and use TIMEVAL_AFTER to test.

2013-11-25 18:35:48 +00:00

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