Fix memery leak of QXlsx::Cell

src/xlsx/xlsxcell.cpp

@@ -58,6 +58,14 @@ Cell::Cell(const QVariant &data, DataType type, Format *format, Worksheet *paren
     d_ptr->parent = parent;
 }
 
+/*!
+ * Destroys the Cell and cleans up.
+ */
+Cell::~Cell()
+{
+    delete d_ptr;
+}
+
 /*!
  * Return the dataType of this Cell
  */

src/xlsx/xlsxcell.h

@@ -57,12 +57,12 @@ public:
     bool isDateTime() const;
     QDateTime dateTime() const;
 
+    ~Cell();
 private:
     friend class Worksheet;
     friend class WorksheetPrivate;
 
     Cell(const QVariant &data=QVariant(), DataType type=Blank, Format *format=0, Worksheet *parent=0);
-
     CellPrivate * const d_ptr;
 };