checks: Fix bus-range check

The upper limit of the bus-range is specified by the second cell of the
bus-range property.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Message-Id: <20210629114304.2451114-1-thierry.reding@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

checks.c

@@ -892,7 +892,7 @@ static void check_pci_device_bus_num(struct check *c, struct dt_info *dti, struc
 	} else {
 		cells = (cell_t *)prop->val.val;
 		min_bus = fdt32_to_cpu(cells[0]);
-		max_bus = fdt32_to_cpu(cells[0]);
+		max_bus = fdt32_to_cpu(cells[1]);
 	}
 	if ((bus_num < min_bus) || (bus_num > max_bus))
 		FAIL_PROP(c, dti, node, prop, "PCI bus number %d out of range, expected (%d - %d)",