atusb/fw/mac.c: check CRC and auto-discard bad frames
atusb/fw/mac.c: check CRC and auto-discard bad frames

cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan