[log_accel] Minor refactoring.

Unless I am misunderstanding the intention behind the equation:

    (A - D)/C - (B - D)/C = (A - B)/C

The output seems to be exactly the same:

    Before:
    =======
     1m7s000│Nov 11 06:45:01 XXX-XXX CRON[28452]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    11m7s000│Nov 11 06:55:01 XXX-XXX CRON[28819]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    21m7s000│Nov 11 07:05:01 XXX-XXX CRON[29186]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    31m7s000│Nov 11 07:15:01 XXX-XXX CRON[29552]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    33m7s000│Nov 11 07:17:01 XXX-XXX CRON[29629]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
    41m7s000│Nov 11 07:25:01 XXX-XXX CRON[29922]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    51m7s000│Nov 11 07:35:01 XXX-XXX CRON[30290]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
   1h1m7s000│Nov 11 07:45:01 XXX-XXX CRON[30657]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)

    After:
    ======
     1m7s000│Nov 11 06:45:01 XXX-XXX CRON[28452]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    11m7s000│Nov 11 06:55:01 XXX-XXX CRON[28819]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    21m7s000│Nov 11 07:05:01 XXX-XXX CRON[29186]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    31m7s000│Nov 11 07:15:01 XXX-XXX CRON[29552]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    33m7s000│Nov 11 07:17:01 XXX-XXX CRON[29629]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
    41m7s000│Nov 11 07:25:01 XXX-XXX CRON[29922]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
    51m7s000│Nov 11 07:35:01 XXX-XXX CRON[30290]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
   1h1m7s000│Nov 11 07:45:01 XXX-XXX CRON[30657]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)

Some names and identifying details in the log snippets above have been changed
to protect the privacy of individuals. Any resemblance to actual computers,
sentient or otherwisei, is purely coincidental.