Memcpy length check issue with per chan and reduced slot count
Memcpy length check issue with per chan and reduced slot count

Resolves #189
marcusbirkin/sacnview,docsteer/sacnview,marcusbirkin/sacnview,marcusbirkin/sacnview,marcusbirkin/sacnview,docsteer/sacnview,docsteer/sacnview,docsteer/sacnview,marcusbirkin/sacnview,marcusbirkin/sacnview,marcusbirkin/sacnview,docsteer/sacnview,docsteer/sacnview,docsteer/sacnview