[v3] Fix to time_get for end deref

[Paolo Carlini]

Hi,

noticed a couple of remaining places (most already fixed for 3.4)
where we risked dereferencing end iterators.

Tested x86-linux, committing to mainline (soon 3_4 too).

Paolo.

P.S. Later, we can consider reorganizing a bit where in the time_get
helpers we set __err |= ios_base::eofbit / check for it...

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