[BUG] Memory leak if exception is thrown

[maxsharabayko]

As noted in the comment, PR #1393 did not handle the allocated resources properly if exception is thrown.

Consider function CUDTUnited::updateMux(..)

    m.m_pTimer = new CTimer;
    m.m_pSndQueue = new CSndQueue;
    // ..
}
catch (..)
{
    // TODO: delete m.m_pSndQueue, etc.
}