device property: Reuse property_entry_free_data()

Reuse property_entry_free_data() in property_entry_copy_data()
to make code slightly cleaner.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>