iconv: adding missing break

break is probably intended and correct,
but has no correctness implications due to is94 => is96

Reviewed by:	cem, jilles
Reported by:	swildner@DragonFlyBSD.org
MFC After:	1 week

lib/libiconv_modules/ISO2022/citrus_iso2022.c

@@ -776,6 +776,7 @@ asis:
 	case CS94:
 		if (!(is94(string[0] & 0x7f)))
 			goto asis;
+		break;
 	case CS96:
 		if (!(is96(string[0] & 0x7f)))
 			goto asis;