Remove algo logic duplication Round 3

[Paolo Carlini]

Hi,

"François Dumont" <frs.dumont@gmail.com> ha scritto:
>Could you show me an example of invalid open round bracket cause I do
>not normally do what you describe and I can't see any.

"Invalid" is definitely too strong ;) Anyway, I noticed one at the end of __lexicographical_compare<>::__lc and then it occurred to me that I had noticed other in the past.

Paolo