Peter Zhu 7ef8bb129f Fix memory leak in Ripper.sexp
rb_ast_dispose does not free the rb_ast_t causing it to be leaked. This
commit changes it to use rb_ast_free instead.

For example:

    require "ripper"

    10.times do
      100_000.times do
        Ripper.sexp("")
      end

      puts `ps -o rss= -p #{$$}`
    end

Before:

    27648
    32512
    37376
    42240
    47232
    52224
    57344
    62208
    67072
    71936

After:

    22784
    22784
    22784
    22784
    22912
    22912
    22912
    22912
    22912
    22912
2024-05-01 11:09:54 -04:00
..
2024-03-26 12:54:54 +01:00
2024-05-01 11:09:54 -04:00
2024-05-01 17:46:41 +09:00
2024-04-22 19:15:53 +00:00