block: ioctl fixes for v5.5 My work on eliminating the fs/compat_ioctl.c and block/compat_ioctl.c files for linux-5.6 uncovered a couple of bugs that should be fixed as soon as possible: - the pktcdvd driver was broken in linux-5.5 with my previous cleanup series and needs a oneline patch. - multiple ioctl commands were added in the past two years without a compat handler, I'm adding one patch per kernel version that needs the fixes to be backported. Signed-off-by: Arnd Bergmann <arnd@arndb.de>