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REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1563 SnpDxe initializes values for MemoryBarIndex and IoBarIndex to 0 and 1 respectively even if calls to PciIo->GetBarAttributes never return success. Later, if the BAR is used to perform IO/Mem reads/writes, a potentially non-existent BAR index may be accessed. This change initializes the values to an invalid BAR index (PCI_MAX_BAR) so the condition can be explicitly checked to avoid an invalid BAR access. Cc: Siyuan Fu <siyuan.fu@intel.com> Cc: Maciej Rabeda <maciej.rabeda@linux.intel.com> Cc: Jiaxin Wu <jiaxin.wu@intel.com> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com> Reviewed-by: Siyuan Fu <siyuan.fu@intel.com> Reviewed-by: Maciej Rabeda <maciej.rabeda@linux.intel.com>