patch 9.2.0610: cindent: closing brace in a comment affects the next line's indent

patch 9.2.0610: cindent: closing brace in a comment affects the next line's indent

Problem:  A '}' inside a // line comment changes the indentation of the
          following line inside an enum or struct (rendcrx).
Solution: Stop scanning the line once a line comment is reached, so a brace
          inside the comment is no longer mistaken for an unmatched brace.

fixes:  #20455
closes: #20458

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Hirohito Higashi <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>