* libmisc/fields.c: Avoid assignments in comparisons, assignments

	* libmisc/fields.c: Avoid assignments in comparisons, assignments
	with post increments (x++), use of integers as booleans, and
	explicitly mark blocks with brackets.
	* libmisc/copydir.c: Likewise.
	* libmisc/fields.c: Add comments.
	* libmisc/copydir.c: Mark function whose return value is not
	checked as such.

	* libmisc/copydir.c (remove_tree): Make sure unlink is successful
	when removing files.