1. Don't assume that flush the HOB variable to flash must be successful.

2. When no DELETED variable found, no variable space could be reclaimed, so just give some debug info and return EFI_SUCCESS.

Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14029 6f19259b-4bc3-4df7-8a09-765794883524

SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.h

@@ -99,6 +99,19 @@ typedef struct {
   VOID        *Data;
 } VARIABLE_CACHE_ENTRY;
 
+/**
+  Flush the HOB variable to flash.
+
+  @param[in] VariableName       Name of variable has been updated or deleted.
+  @param[in] VendorGuid         Guid of variable has been updated or deleted.
+
+**/
+VOID
+FlushHobVariableToFlash (
+  IN CHAR16                     *VariableName,
+  IN EFI_GUID                   *VendorGuid
+  );
+
 /**
   Writes a buffer to variable storage space, in the working block.