[boost] typo in wave/util/flex_string.hpp

From: Neal Becker (ndbecker2_at_[hidden])
Date: 2007-03-20 11:56:08

Surely this is a typo:
./boost/wave/util/flex_string.hpp:1644: warning: statement has no effect

    flex_string& append(const value_type* s, const size_type n)
    { 
        Invariant checker(*this); checker;