[jnc_io] fix: AsyncIoDevice::m_readOverflowBuffer was not cleared on open; this could leave to inconsisten buffer state when a device is closed during intense IO and then re-opened
[jnc_io] fix: AsyncIoDevice::m_readOverflowBuffer was not cleared on open; this could leave to inconsisten buffer state when a device is closed during intense IO and then re-opened

vovkos/jancy,vovkos/jancy,vovkos/jancy,vovkos/jancy,vovkos/jancy