attach: cleanup macros lxc_proc_close_ns_fd

src/lxc/attach.c

@@ -125,14 +125,8 @@ static struct lxc_proc_context_info *lxc_proc_get_context_info(pid_t pid)
 
 static inline void lxc_proc_close_ns_fd(struct lxc_proc_context_info *ctx)
 {
-	int i;
-
-	for (i = 0; i < LXC_NS_MAX; i++) {
-		if (ctx->ns_fd[i] < 0)
-			continue;
-
-		close(ctx->ns_fd[i]);
-		ctx->ns_fd[i] = -EBADF;
+	for (int i = 0; i < LXC_NS_MAX; i++) {
+		__do_close_prot_errno int fd = ctx->ns_fd[i];
 	}
 }