bug#73985: fix: charset.max_char may be used before being set

[altermo31 via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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Problem:
If the value to be set to charset.max_char is invalid, an error occurs, but the error uses the yet unset charset.max_char.

Solution:
Use the value that charset.max_char would be set to if the value wasn't invalid.

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From 64e9557c5f6ae4416a1a12fd6f68f0d19931bb99 Mon Sep 17 00:00:00 2001
From: altermo <107814000+altermo@users.noreply.github.com>
Date: Thu, 24 Oct 2024 13:39:06 +0200
Subject: [PATCH] fix: charset.max_char may be used before being set

---
 src/charset.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/charset.c b/src/charset.c
index e8d0826..14b33d2 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -1007,7 +1007,7 @@ DEFUN ("define-charset-internal", Fdefine_charset_internal,
 
       i = CODE_POINT_TO_INDEX (&charset, charset.max_code);
       if (MAX_CHAR - charset.code_offset < i)
-	error ("Unsupported max char: %d", charset.max_char);
+	error ("Unsupported max char: %d", i + charset.code_offset);
       charset.max_char = i + charset.code_offset;
       i = CODE_POINT_TO_INDEX (&charset, charset.min_code);
       charset.min_char = i + charset.code_offset;
-- 
2.47.0