Add back proper bv_len initialization

Need to find and fix test010 properly.

servers/slapd/passwd.c

@@ -68,7 +68,9 @@ int passwd_extop(
 		return LDAP_STRONG_AUTH_REQUIRED;
 	}
 
+	qpw->rs_old.bv_len = 0;
 	qpw->rs_old.bv_val = NULL;
+	qpw->rs_new.bv_len = 0;
 	qpw->rs_new.bv_val = NULL;
 	qpw->rs_mods = NULL;
 	qpw->rs_modtail = NULL;