[Patch v2] MdeModulePkg: Initialize local variable value before they are used

["gaoliming" <gaoliming@byosoft.com.cn>]

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3228
This change is to fix the false compiler error on GCC49 release build.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Signed-off-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
---
 In V2, add the comments for the false compiler warning

 MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c             | 5 +++++
 .../VariablePolicyHelperLib/VariablePolicyHelperLib.c        | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
index e99a812a44..1053695b3b 100644
--- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
+++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
@@ -1127,6 +1127,11 @@ AhciDmaTransfer (
     return EFI_INVALID_PARAMETER;
   }
 
+  //
+  // Set Status to suppress incorrect compiler/analyzer warnings
+  //
+  Status = EFI_SUCCESS;
+
   //
   // DMA buffer allocation. Needs to be done only once for both sync and async
   // DMA transfers irrespective of number of retries.
diff --git a/MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.c b/MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.c
index 0c9299c8b0..6bcb95247f 100644
--- a/MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.c
+++ b/MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.c
@@ -115,6 +115,11 @@ CreateBasicVariablePolicy (
     return EFI_INVALID_PARAMETER;
   }
 
+  //
+  // Set NameSize to suppress incorrect compiler/analyzer warnings
+  //
+  NameSize  = 0;
+
   // Now we've gotta determine the total size of the buffer required for
   // the VariablePolicy structure.
   TotalSize = sizeof( VARIABLE_POLICY_ENTRY );
-- 
2.27.0.windows.1