Please review: [Bug 629710] escape_string does not check '\<HEX><HEX>'

[Noriko Hosoi]

https://bugzilla.redhat.com/show_bug.cgi?id=629710

https://bugzilla.redhat.com/attachment.cgi?id=442728&action=diff
https://bugzilla.redhat.com/attachment.cgi?id=442728&action=edit

Description: do_escape_string (core of escape_string) converts
'\ (backslash)' to '\5C' even if the following 2 characters are
hex digits.  That is, the character is already escaped.  This
patch checks the case and if it is, it does not escape it further.

File: ldap/servers/slapd/util.c

Thanks,
--noriko