Spreadsheet: Fix old ref to name in doc

src/Mod/Spreadsheet/App/Sheet.cpp

@@ -118,7 +118,7 @@ Sheet::~Sheet()
         // Don't let an exception propagate out of a destructor (calls terminate())
         Base::Console().Error(
             "clearAll() resulted in an exception when deleting the spreadsheet : %s\n",
-            *pcNameInDocument);
+            getNameInDocument());
     }
 }