Regression in 2.2.11

Hi,

  I found a regression in indent 2.2.11.

  The following code
a = !!b;
  Now becomes
a = ! !b;

  This used to work perfectly fine with most versions of indent prior to
2.2.11.

  The regression was introduced with the 'fix' for avoiding "- --a"
becomeing "---a".

  A simple fix for this would be to check if the token in question is
not the '!' operator:

Line 616:
-------------
            if ((parser_state_tos->last_token == unary_op) &&
-               (e_code > s_code) &&
+               (e_code > s_code) && (*res != '!') &&
                (*(e_code - 1) == *res))
            {
                *(e_code++) = ' ';
            }
--------------

Sample test for regression:
------------------
int
foo(int a)
{
  return !!a;
}
------------------

   Edward