Warnings cleanup

clients/tools/common.c

clients/tools/ldapsearch.c

libraries/libldap/abandon.c

libraries/libldap/ldap_sync.c

libraries/libldap/request.c

libraries/liblutil/passwd.c

libraries/liblutil/utils.c

servers/slapd/aci.c

servers/slapd/alock.c

servers/slapd/attr.c

servers/slapd/back-bdb/add.c

servers/slapd/back-bdb/back-bdb.h

servers/slapd/back-bdb/cache.c

servers/slapd/back-bdb/delete.c

servers/slapd/back-bdb/modify.c

servers/slapd/back-bdb/modrdn.c

servers/slapd/back-bdb/monitor.c

servers/slapd/back-bdb/tools.c

servers/slapd/back-ldif/ldif.c

servers/slapd/back-meta/bind.c