-Fix [FS#5830] (r22567) (r25956-ish): Backup data of altered persistent storage arrays was freed twice.

git-svn-id: http://svn.openttd.org/trunk@26161 6aa0318a-3be1-0310-93fa-89fd2396df07
-Update from WebTranslator v3.0:
thai - 1 changes by nirakanz


git-svn-id: http://svn.openttd.org/trunk@26162 6aa0318a-3be1-0310-93fa-89fd2396df07