Revert "IDE: Do not flush empty CDROM drives"

This reverts commit 4da97120d51a4383aa96d741a2b837f8c4bbcd0b.

blk_aio_flush() now handles the blk->root == NULL case, so we no longer
need this workaround.

Cc: John Snow <jsnow@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
1 file changed