improve cardhopper to improve reliability when parts of the packet are buffered

[nvx]

if packets arrive in quick succession part of the next packet can sit in the buffer which isn't checked by cardhopper resulting in the standalone hanging. this makes it check for data in the internal buffer too preventing that condition.

I expect the same benefit may occur in recieve_ng (sic) by changing the usb_poll_validate_length() check to be usb_read_ng_has_buffered_data() || usb_poll_validate_length() as this does in the cardhopper standalone but it'd need more testing. I've been testing this change with cardhopper for a few months now and I'm confident it's good but haven't tested the same change in recieve_ng yet

[github-actions]

You are welcome to add an entry to the CHANGELOG.md as well

[iceman1001]

Excellent!