Obviously, we want to pass &local_err so that we can check it then
line below, not errp.

Reported-by: Coverity CID 1419395 'Constant' variable guards dead code
Fixes: 4f9924c4 "ppc/pnv: Add models for POWER9 PHB4 PCIe Host bridge"
Signed-off-by: NGreg Kurz <groug@kaod.org>
Message-Id: <158153364605.3229002.2796177658957390343.stgit@bahia.lan>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>