DCF77 driver seems to be broken

[Eric S. Raymond]

Achim Gratz <Stromeko at nexgo.de>:
> Achim Gratz writes:
> > This bisects to 96fff4a, although I have a hard time understanding why.
> > Some of that seems to have been "prepared" in the commits running up to
> > this.  Anyway, the DCF77 driver thinks that each second is the last one
> > in the minute after this commit landed.
> 
> The latter effect is indeed introduced by this commit.  The breakage
> actually occurs with the previous commit cefd690, although here the
> minute mark is merely not recognized and as a result the offset is
> calculated completely wrong.

I'd revert this, but I didn't understand it well enough to avoid breaking it.
Can you supply a fix patch?

If not, file an issue and I'll give it a try.
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