bug#64283: 29.0.91; js-mode's mark-defun does not work correctly when functions have a comment on top

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

Daniel Martín via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@gnu.org> writes:

> This is a regression from Emacs 28.2.
>

This is the first commit where this bug happens:

commit 4489450f37deafb013b1f0fc00c89f0973fda14a
Author: Yuan Fu <casouri@gmail.com>
Date:   Thu Nov 10 15:00:29 2022 -0800

    In end-of-defun, terminate early if no further defun exists
    
    Before this change, end-of-defun calls end-of-defun-function even if
    point is not necessarily at the beginning of a defun (contrary to what
    end-of-defun-function's docstring claims).  Now it terminates early
    and doesn't call end-of-defun-function.
    
    * lisp/emacs-lisp/lisp.el (beginning-of-defun-raw): Update docstring
    clarifying the return value.
    (end-of-defun): Terminate early if beginning-of-defun-raw returns nil.