[PATCH] PCI: i386 mmconfig: don't forget bus number when setting fallback_slots bits

On i386 PCI mmconfig forgets the bus number when setting the fallback_slots
bits which means fallback to conf1 only works for bus 0.

Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>