The patch below makes several functions in cdrom.c static.

This includes cdrom_is_mrw and cdrom_is_random_writable which were
EXPORT_SYMBOL'ed but weren't used anywhere outside of cdrom.h .
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>