Fix the following compilation warning for NDEBUG build (make NDEBUG=1):
Fix the following compilation warning for NDEBUG build (make NDEBUG=1):

    cc1plus: warnings being treated as errors
    mordor/http/client.cpp: In member function ‘void Mordor::HTTP::ClientConnection::invariant() const’:
    mordor/http/client.cpp:271: warning: unused variable ‘request’

Signed-off-by: Ron <61adede2f9c9000f26d4b121ad18871af3fa5a1a@decho.com>
Change-Id: I5a48ae8aeb5c3460fccd061d49ed34a993be286b
Reviewed-on: http://gerrit.dechocorp.com/2772
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@mozy.com>

ccutrer/mordor,adfin/mordor,mozy/mordor,mozy/mordor,mozy/mordor,cgaebel/mordor,mtanski/mordor,mtanski/mordor,adfin/mordor,adfin/mordor,ccutrer/mordor,mtanski/mordor,cgaebel/mordor,ccutrer/mordor