[Patch] To filebuf::underflow vs codecvt::in

[Paolo Carlini]

Hi,

this issue has been reported to the Novell Bugzilla: the fix seems easy, 
just don't call codecvt::in when eof is reached and there are no chars 
to convert. Apparently this kind of behavior can be seen also in other 
implementations. Tested x86-linux, will wait till the endo of today 
before committing to mainline.

Paolo.

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