use const in SvNumberformat::GetOutputString when possible

Change-Id: I364b1ac36f999f4309b3aab2ef0c55ff2147ef43

svl/inc/svl/zformat.hxx

@@ -233,7 +233,7 @@ public:
     void SetStarFormatSupport( bool b )         { bStarFlag = b; }
 
     NfHackConversion Load( SvStream& rStream, ImpSvNumMultipleReadHeader& rHdr,
-        SvNumberFormatter* pConverter, ImpSvNumberInputScan& rISc );
+                           SvNumberFormatter* pConverter, ImpSvNumberInputScan& rISc );
     void Save( SvStream& rStream, ImpSvNumMultipleWriteHeader& rHdr  ) const;
 
     // Load a string which might contain an Euro symbol,
@@ -247,7 +247,7 @@ public:
     bool GetOutputString( double fNumber, sal_uInt16 nCharCount, OUString& rOutString ) const;
 
     bool GetOutputString( double fNumber, OUString& OutString, Color** ppColor );
-    bool GetOutputString( OUString& sString, OUString& OutString, Color** ppColor );
+    bool GetOutputString( const OUString& sString, OUString& OutString, Color** ppColor );
 
     // True if type text
     bool IsTextFormat() const { return (eType & NUMBERFORMAT_TEXT) != 0; }

svl/source/numbers/zformat.cxx

@@ -2188,7 +2188,7 @@ short SvNumberformat::ImpCheckCondition(double& fNumber,
     }
 }
 
-bool SvNumberformat::GetOutputString(OUString& sString,
+bool SvNumberformat::GetOutputString(const OUString& sString,
                                      OUString& OutString,
                                      Color** ppColor)
 {