Return ZIO_PIPELINE_CONTINUE on error, and ZIO_PIPELINE_STOP on success.
vdev_disk had a few reversed. This makes vdev_disk work as well as
vdev_file.
    Return ZIO_PIPELINE_CONTINUE on error, and ZIO_PIPELINE_STOP on success.
    vdev_disk had a few reversed. This makes vdev_disk work as well as
    vdev_file.

Merge branch 'master' of github.com:zfs-osx/zfs

Conflicts:
	module/zfs/vdev_disk.c