bug#71205: 29.3; Automatic indentation of c-ts-mode doesn't work well for me.

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 26 May 2024 13:32:37 +0900
> From: 川本 琢二
>  (Dr.Sc.KAWAMOTO, Takuji) <kawamoto.takuji@gmail.com>
> 
> 1. Start emacs.
> 2. Open the C source code file and write the following content.
> 
> ----------- c source code file begins -------------
> void test(void)
> {
>    do🔳
> ----------- c source code file ends ---------------
> 
> 3. Place the cursor after `do` and press Return.
> 
> Expected behaviour is automatic indentation. I want to move the cursor 
> to the 5th column of the next line.
> However, the observed behavior is NOT indentation. The cursor moves to 
> the 1st column of the next line.

I think this is because the above source code fails to parse.  If you
add a closing brace after the "do" line, and then repeat your recipe,
the cursor goes to column 3.

Yuan, can you please look into this?