count.c: Bugfix count ovfl in recent refactoring #1519
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In 6c4283a (*), I neglected the comments on overflow handling when I created
scount ()and mistakenly used a 32 int there as an accumulator. I found this problem when the long "And yet he..." sentence caused two overflows while debugging.I fixed it and also added an overflow-detection comment.
(*) This commit message says
mcount()instead ofscount().