* src/chsh.c: Use a bool when possible instead of int integers.

	* src/chsh.c: Use a bool when possible instead of int integers.
	* src/chsh.c: restricted_shell() renamed is_restricted_shell().
	check_shell() renamed shell_is_listed().
	* src/chsh.c: Ignore return value of setlocale(),
	bindtextdomain(), and textdomain().
	* src/chsh.c: Avoid implicit conversion of pointers / integers
	to booleans.
	* src/chsh.c: Ignore the return value of pam_end() before
	exiting.