hmmmmmmm i haven't used this but these are the troubleshooting steps i would go through
first thing if you built the kernel driver as a module you have to load it and possibly at boot so udev can create device nodes
(i think it's called pktcdvd ?) like you hadn't got that far
you might want to try building udftools without that patch -- it might be specific for the kernel ??
check out how the instructions are different for kernel 2.6.8 (the one blfs is written for)
in particular device names seem to be different with the newer kernel driver ?
try reading kernel docs /Documentation/cdrom/packet-writing.txt
and check out the script there /etc/init.d/cdrw
it seems to be a smart try at the pktsetup command
like always go back and try
and see if that fixes it
since you are using the newer kernel module than is in the instructions try to get the newest udftools
possibly even from cvs
sorry can't help more