MdeModulePkg/Bds: Fix VS2010/VS2012 build failure.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Shumin Qiu <shumin.qiu@intel.com>

MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c

@@ -1667,6 +1667,8 @@ BmGetFileBufferFromLoadFileFileSystem (
     Handles = NULL;
     HandleCount = 0;
   }
+
+  Handle = NULL;
   for (Index = 0; Index < HandleCount; Index++) {
     Node = DevicePathFromHandle (Handles[Index]);
     Status = gBS->LocateDevicePath (&gEfiLoadFileProtocolGuid, &Node, &Handle);