internal/wayland: clean up pathname socket

This is cleaner than cleaning up in internal/system as it covers the failure paths.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/wayland/wayland-client-helper.h

@@ -24,6 +24,8 @@ typedef enum {
     HAKUREI_WAYLAND_HOST_SOCKET,
     /* connect for host server failed, implemented in conn.go */
     HAKUREI_WAYLAND_HOST_CONNECT,
+    /* cleanup failed, implemented in conn.go */
+    HAKUREI_WAYLAND_CLEANUP,
 } hakurei_wayland_res;
 
 hakurei_wayland_res hakurei_security_context_bind(