[POWERPC] EEH: Fix PCI bridge handling bug

The EEH code needs to ignore PCI bridges; sort-of.  It was ignoring
them in the wrong place, and thus failing to set up the
PCI_DN(dn)->pcidev pointer.  Imprudent dereferencing of this pointer
would lead to a crash on cards with bridges.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
----
 arch/powerpc/platforms/pseries/eeh_cache.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
Signed-off-by: Paul Mackerras <paulus@samba.org>