ieee1394: fix list corruption (reported at module removal)

If there is more than one FireWire controller present, dummy_zero_addr
and dummy_max_addr were added multiple times to different lists, thus
corrupting the lists.  Fix this by allocating them dynamically per host
instead of just once globally.

(Perhaps a better address space allocation algorithm could rid us of the
two dummy address spaces.)

Fixes http://bugzilla.kernel.org/show_bug.cgi?id=10129

 .

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>