Remove dead code in qemuDomainAssignPCIAddresses

We tested for positive return value from virDomainMaybeAddController,
but it returns 0 or -1 only resulting in a dead code.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_command.c

@@ -1509,9 +1509,9 @@ qemuDomainAssignPCIAddresses(virDomainDefPtr def,
                          i, bus->model)) < 0)
                     goto cleanup;
                 /* If we added a new bridge, we will need one more address */
-                if (rv > 0 && virDomainPCIAddressReserveNextSlot(addrs, &info,
-                                                                 flags) < 0)
-                        goto cleanup;
+                if (rv == 0 &&
+                    virDomainPCIAddressReserveNextSlot(addrs, &info, flags) < 0)
+                    goto cleanup;
             }
             nbuses = addrs->nbuses;
             virDomainPCIAddressSetFree(addrs);