agetty: Fix input of non-ASCII characters in get_logname()

As login supports non-ASCII characters in the logname, agetty should be
consistent.

8b58ffd re-activated old and ASCII-only get_logname(), which restricted
the input to ASCII only. As the code does not read whole characters,
isascii(ascval) and isprint(ascval) returns nonsenses after entering a
non-ASCII character.

As keyboard maps don't contain unprintable non-control characters, it
seems to be relatively safe to remove both checks.

Signed-off-by: Stanislav Brabec <sbrabec@suse.cz>
Cc: Lubomir Rintel <lkundrak@v3.sk>
Tested-by: Lubomir Rintel <lkundrak@v3.sk>

term-utils/agetty.c

@@ -2175,8 +2175,6 @@ static char *get_logname(struct issue *ie, struct options *op, struct termios *t
 			case CTL('D'):
 				exit(EXIT_SUCCESS);
 			default:
-				if (!isascii(ascval) || !isprint(ascval))
-					break;
 				if ((size_t)(bp - logname) >= sizeof(logname) - 1)
 					log_err(_("%s: input overrun"), op->tty);
 				if ((tp->c_lflag & ECHO) == 0)