OvmfPkg/AcpiPlatformDxe: Use local variable in CloudHvAcpi.c

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4237

The handle of mChAcpiHandle is not needed for anything, beyond the
scope of the InstallCloudHvTablesTdx (). A local variable (ChAcpiHandle)
suffices for storing the handle.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Sebastien Boeuf <sebastien.boeuf@intel.com>
Reported-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
Message-Id: <20230111012235.189-3-min.m.xu@intel.com>
Reviewed-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

OvmfPkg/AcpiPlatformDxe/CloudHvAcpi.c

@@ -20,8 +20,6 @@
 
 #include "AcpiPlatform.h"
 
-EFI_HANDLE  mChAcpiHandle = NULL;
-
 EFI_STATUS
 EFIAPI
 InstallCloudHvTablesTdx (
@@ -30,6 +28,7 @@ InstallCloudHvTablesTdx (
 {
   EFI_STATUS  Status;
   UINTN       TableHandle;
+  EFI_HANDLE  ChAcpiHandle;
 
   EFI_PEI_HOB_POINTERS         Hob;
   EFI_ACPI_DESCRIPTION_HEADER  *CurrentTable;
@@ -89,8 +88,9 @@ InstallCloudHvTablesTdx (
   // Install a protocol to notify that the ACPI table provided by CH is
   // ready.
   //
+  ChAcpiHandle = NULL;
   gBS->InstallProtocolInterface (
-         &mChAcpiHandle,
+         &ChAcpiHandle,
          &gQemuAcpiTableNotifyProtocolGuid,
          EFI_NATIVE_INTERFACE,
          NULL