matchedValues control causes ldapsearch to core-dump if the matching rule is missing (ITS#3216)

[ando@sys-net.it]

Full_Name: Pierangelo Masarati
Version: HEAD/2.2/2.1
OS: irrelevant
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (81.74.43.82)
Submitted by: ando


apparently there's an error in parsing
extended value filters of the type <attr>:=<value>.

p.