(ITS#4189) potential double free of dangling pointer in back-ldap

[ando@sys-net.it]

Full_Name: Pierangelo Masarati
Version: HEAD/re23
OS: irrelevant
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (131.175.154.56)
Submitted by: ando


In case of retry, in some cases the ldapconn_t structure could be freed by
ldap_back_retry; however, since it was passed by value, it would be either freed
or released a second time by the caller.

This is now fixed in HEAD.