[Patch, RFA] Small clean-up to copyfmt

[Paolo Carlini]

Hi,

I was studying how we are implementing the detailed requirements in the
standard and noticed these bits, redundant, therefore confusing: we are
already dealing with _M_word != _M_local_word three lines above and, if
I'm not wrong, nothing can change _M_word in the middle.

Tested x86-linux, will wait 24 hours in case I'm missing something.

Paolo.

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