* src/login_nopam.c: Do not use the YES and NO macros. Use the

	* src/login_nopam.c: Do not use the YES and NO macros. Use the
	booleans true and false instead. Change the prototypes of
	list_match(), user_match(), from_match(), and string_match()
	accordingly. Also use booleans internally.
	* src/login_nopam.c: Add brackets and parenthesis.
	* src/login_nopam.c: Avoid implicit conversion of pointers /
	integers / chars to booleans.
	* src/login_nopam.c: Avoid assignments in comparisons.