xf86GetPciDomain(...) returns 1 if the PCI domain is 0, so fix the off-by-one;
otherwise DRICreatePCIBusID(...) returns a string with the wrong PCI domain
which can lead to detection problems.

(Only applies to 1.4, master with the pci-rework should do this correctly)

Signed-off-by: Tim Yamin <tim.yamin@zonbu.com>

--- hw/xfree86/dri/dri.c~	2007-12-07 02:38:42.000000000 +0000
+++ hw/xfree86/dri/dri.c	2008-02-01 18:59:51.000000000 +0000
@@ -2461,6 +2461,8 @@
 
     tag = pciTag(PciInfo->bus, PciInfo->device, PciInfo->func);
     domain = xf86GetPciDomain(tag);
+    if(domain > 0)
+	domain--;
     snprintf(busID, 20, "pci:%04x:%02x:%02x.%d", domain,
 	PCI_BUS_NO_DOMAIN(PciInfo->bus), PciInfo->device, PciInfo->func);
     return busID;