MdeModulePkg PeiCore: Fix VS2012 build failure

fwvol.c(1572) : warning C4701: potentially uninitialized
local variable 'Status' used

The build failure is caused by
0e042d0ad76157ac9bad17bb4e1ff2919ca0d8f4 for
https://bugzilla.tianocore.org/show_bug.cgi?id=1131

This patch initializes Status to fix the build failure.

Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>
diff --git a/MdeModulePkg/Core/Pei/FwVol/FwVol.c b/MdeModulePkg/Core/Pei/FwVol/FwVol.c
index 7ea503a..5629c9a 100644
--- a/MdeModulePkg/Core/Pei/FwVol/FwVol.c
+++ b/MdeModulePkg/Core/Pei/FwVol/FwVol.c
@@ -1412,6 +1412,8 @@
   ParentFvHandle = ParentFvCoreHandle->FvHandle;

   ParentFvPpi    = ParentFvCoreHandle->FvPpi;

 

+  Status = EFI_SUCCESS;

+

   //

   // Find FvImage(s) in FvFile

   //