fix access to free()d memory

fix access to free()d memory

the 'item' reference may become invalid inside the loop.

this approach was chosen (instead of making 'item' a non-reference) to
keep the code more in sync with creator (where the string type is more
complex).

Change-Id: I60a4b0654dc47c0e3466d43904c358eb7e3e64e2
Reviewed-By: Marius Storm-Olsen
Reviewed-on: http://codereview.qt.nokia.com/1702
Reviewed-by: Marius Storm-Olsen <marius.storm-olsen@nokia.com>