[POWERPC] celleb: Fix PCI config space accesses to subordinate buses

Checking whether bus->self is NULL is not enough to know "bus" is the
primary bus.

Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Signed-off-by: Paul Mackerras <paulus@samba.org>
1 file changed