In PcatPciRootBridge.c -> GetPciExpressBaseAddressForRootBridge, fixed a hang condition if the PCI Express Base Address HOB is not present. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6684 6f19259b-4bc3-4df7-8a09-765794883524