[patch] PcAtChipsetPkg/IsaAcpiDxe: Fix VS2012 build failure

[Dandan Bi <dandan.bi@intel.com>]

Done:
if (EFI_ERROR (Status)) {
  if (PciIo != NULL && Enabled) {
    PciIo->Attributes (
             PciIo,
             EfiPciIoAttributeOperationSet,
             OriginalAttributes,
             NULL
             );
  }
}
In above codes, VS2012/VS2010 will report that "OriginalAttributes"
will be used without initialization. But in fact, when the if expression
is true(if (PciIo != NULL && Enabled)), the "OriginalAttributes" must be
initialized. In order to fix this false positive issue, we initialize the
"OriginalAttributes" after declaration.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
---
 PcAtChipsetPkg/IsaAcpiDxe/PcatIsaAcpi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/PcAtChipsetPkg/IsaAcpiDxe/PcatIsaAcpi.c b/PcAtChipsetPkg/IsaAcpiDxe/PcatIsaAcpi.c
index d82e2c4..c7ea559 100644
--- a/PcAtChipsetPkg/IsaAcpiDxe/PcatIsaAcpi.c
+++ b/PcAtChipsetPkg/IsaAcpiDxe/PcatIsaAcpi.c
@@ -176,10 +176,11 @@ PcatIsaAcpiDriverBindingStart (
   BOOLEAN              Enabled;
 
   Enabled = FALSE;
   Supports = 0;
   PcatIsaAcpiDev = NULL;
+  OriginalAttributes = 0;
   //
   // Open the PCI I/O Protocol Interface
   //
   PciIo = NULL;
   Status = gBS->OpenProtocol (
-- 
1.9.5.msysgit.1