get one from overlap

diff --git a/src/devices/hypertransport.c b/src/devices/hypertransport.c
index c752d78..38d9f51 100644
--- a/src/devices/hypertransport.c
+++ b/src/devices/hypertransport.c
@@ -521,7 +521,7 @@ unsigned int hypertransport_scan_chain(struct bus *bus,
 	/* Now that nothing is overlapping it is safe to scan the
 	 * children. 
 	 */
-	max = pci_scan_bus(bus, 0x00, (next_unitid << 3)|7, max); 
+	max = pci_scan_bus(bus, 0x00, ((next_unitid-1) << 3)|7, max); 
 	return max; 
 }