Revert "loplugin:unreffun"

This reverts commit e3246e80.
Which was a mistake.

sc/source/filter/oox/formulaparser.cxx

@@ -472,6 +472,7 @@ protected:
     size_t              appendWhiteSpaceTokens( const WhiteSpaceVec* pSpaces );
     size_t              insertWhiteSpaceTokens( const WhiteSpaceVec* pSpaces, size_t nIndexFromEnd );
 
+    size_t              getOperandSize( size_t nOpCountFromEnd, size_t nOpIndex ) const;
     void                pushOperandSize( size_t nSize );
     size_t              popOperandSize();
 
@@ -724,6 +725,13 @@ size_t FormulaParserImpl::insertWhiteSpaceTokens( const WhiteSpaceVec* pSpaces,
     return pSpaces ? pSpaces->size() : 0;
 }
 
+size_t FormulaParserImpl::getOperandSize( size_t nOpCountFromEnd, size_t nOpIndex ) const
+{
+    OSL_ENSURE( (nOpIndex < nOpCountFromEnd) && (nOpCountFromEnd <= maOperandSizeStack.size()),
+        "FormulaParserImpl::getOperandSize - invalid parameters" );
+    return maOperandSizeStack[ maOperandSizeStack.size() - nOpCountFromEnd + nOpIndex ];
+}
+
 void FormulaParserImpl::pushOperandSize( size_t nSize )
 {
     maOperandSizeStack.push_back( nSize );