ITS#8674 Return correct result from ldap_create_assertion_control_value

ldap_create_assertion_control_value was returning ld->ld_errno
 upon success without reseting it to LDAP_SUCCESS first

libraries/libldap/assertion.c

@@ -31,6 +31,8 @@ ldap_create_assertion_control_value(
 	BerElement		*ber = NULL;
 	int			err;
 
+	ld->ld_errno = LDAP_SUCCESS;
+
 	if ( assertion == NULL || assertion[ 0 ] == '\0' ) {
 		ld->ld_errno = LDAP_PARAM_ERROR;
 		return ld->ld_errno;