[patch] fix ox-latex async export bug

[Rasmus <rasmus@gmx.us>]

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Hi there,

When I try to export documents asynchronously with ox-latex, I always get
a bug in the “org-export-processFOO” files. The last sexp is always something like this: 

    (funcall '#<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_83> "test.tex")

where the “#” and “’” are mixed around. This happens even with a very
simple ‘org-export-async-init-file’ just loading ELPA Org.

This was previously reported here:

    https://lists.gnu.org/archive/html/emacs-orgmode/2021-06/msg00422.html

Nicolas’ fix (replicated in this patch) seems to fix it.
I don’t really understand why this bug happens to be honest.

This happens both on my GNU/Linux system (Emacs v29) and my work Windows
PC (Emacs v28 or v29) [all pre-releases, obviously].

Thanks,
Rasmus

-- 
If you can mix business and politics wonderful things can happen!

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From be15ab50ef4cefc579f87766b21eaed7514379d1 Mon Sep 17 00:00:00 2001
From: Rasmus Pank Roulund <X260@pank.eu>
Date: Sun, 28 Nov 2021 16:34:37 +0100
Subject: [PATCH] org-latex-export-to-pdf: Avoid using lambda function.

Fix "invalid-read-syntax '#'" when exporting asynchronously with
ox-latex.

See also previous bug report: https://lists.gnu.org/archive/html/emacs-orgmode/2021-06/msg00422.html
---
 lisp/ox-latex.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 409d92164..8187119ec 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -3708,7 +3708,7 @@ Return PDF file's name."
   (let ((outfile (org-export-output-file-name ".tex" subtreep)))
     (org-export-to-file 'latex outfile
       async subtreep visible-only body-only ext-plist
-      (lambda (file) (org-latex-compile file)))))
+      #'org-latex-compile)))
 
 (defun org-latex-compile (texfile &optional snippet)
   "Compile a TeX file.
-- 
2.34.1