will never work if anyone attempts to
dereference the bd list as an array (as opposed to something that
might work even though it is wrong).

Finally, this patch moves the definition of bcom_bd up in the file
to eliminate a forward declaration.

Based on patch originally written by Tim Yamin.

Signed-off-by: Tim Yamin <plasm@roo.me.uk>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>