[Toybox] Yet more find cleanup

[Felix Janda]

A little more cleanup in an attached patch.

-exec does only record whether the exit status of the command is zero or
not.

Some unnecessary use of stat could be removed. (The dirtree functions
already do a stat and save its results.)

If no action is found make the command exactly behave as if the operand
expression was in brackets and a "-print" was added to the end.
Previously the code for "-print" was at two places.


In the beginning of find.c there is a comment

/* To Do:
 * -exec action
 */

"-exec [...] ;" seems to be implemented. Then at the end there is also a
comment

void find_main(void)
{
  /* parse filters, if present */
  build_filter_list();

  /* FIXTHIS - parse actions, if present */

  dirtree_read(TT.dir, check_node_callback);
}

That seems to be obsolete (or I don't understand it at all).

Felix
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