Do not use wp_login function it is deprecated , instead use wp_signon.
wp_signon function returns WP_Error on failure so use it to evaluate condition as following.
<?php
if ( 'POST' == $_SERVER['REQUEST_METHOD'] && !empty( $_POST['action'] ) && $_POST['action'] == 'log-in' ) :
$login = wp_signon( array( 'user_login' => $_POST['user-name'], 'user_password' => $_POST['password'], 'remember' => $_POST['remember-me'] ), false );
if ( !is_wp_error($login) ){
save_message( 'success', __( 'You have successfully Login.', 'frontendprofile' ) );
unset($_POST);
wp_redirect( get_permalink( 4 ) );
}
endif;
?>