fix the NO_CCB handling i broke when working on simplifying the midlayer.

marco@ discovered my rewrite retried commands rejected by an adapter
from a timeout, which was trivially starved by normal io going to
disks. this diff allows an xs to be marked as XS_NO_CCB, which will
cause it to be returned to the device driver to be retried as part
of the normal io queue.

tested by krw@ marco@ johan@
ok krw@ marco@

0 files changed, 0 insertions, 0 deletions