Hi,

While burning CD's on 2.6.9 with cdrdao, I noticed it complaining repeatedly:
 ERROR: Read buffer capacity failed.

It tries to read the buffer capacity (MMC command 0x5c) in order to produce a 
percentage reading of how full the buffer is.

This patch permits the READ_BUFFER_CAPACITY command again. Please apply.

Signed-off-by: Daniel Drake <dsd@gentoo.org>