Fixes this build error:

In file included from drivers/macintosh/mediabay.c:21:
include/linux/ide.h:605: error: field 'request_sense_rq' has incomplete type
Signed-off-by: NAlexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>