initialize relative col/row/tab indicees to avoid false positives.

Change-Id: I165b9745b36499e625e6f5d65a622fcfbb535d63

sc/source/core/tool/token.cxx

@@ -448,6 +448,7 @@ static ScSingleRefData lcl_ScToken_InitSingleRef()
 {
     ScSingleRefData aRef;
     aRef.InitAddress( ScAddress() );
+    aRef.nRelCol = aRef.nRelRow = aRef.nRelTab = 0;
     return aRef;
 }