(ITS#7132) syncrepl uses freed naming attrs

[h.b.furuseth@usit.uio.no]

Full_Name: Hallvard B Furuseth
Version: 2.4.28, master
OS: Linux x86_64
URL: 
Submission from: (NULL) (129.240.203.186)
Submitted by: hallvard


syncrepl_entry() reads naming attrs in an entry saved by dn_callback()
in an internal search, after the search returned and released the entry.
Found with valgrind and -DSLAP_NO_SL_MALLOC in test017 with mdb.

Fixing.