Applied James patch that fixes can_cn4linux.c file descriptor handling and make it compatible with can_serial_hub.
Applied James patch that fixes can_cn4linux.c file descriptor handling and make it compatible with can_serial_hub.

inspiredengineering/canfestival3,chrta/canfestival-3-ct,inspiredengineering/canfestival3,inspiredengineering/canfestival3,chrta/canfestival-3-ct,inspiredengineering/canfestival3,chrta/canfestival-3-ct,inspiredengineering/canfestival3,chrta/canfestival-3-ct,chrta/canfestival-3-ct