Fix domain too long error

Reported-by: Ian Eldred Pudney puddles@google.com

This input causes libidn2 to report an error of "domain name longer than 255 characters." However, the punycode domain name is only 146 characters.

    Domain name: 

    髦暩晦晦晦獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳筳獳싂.퐀쓄쓄쓄쓄쓄쓄쓄쓄쓄쓄쓄쓼쓄쓄쓄쓄쓄쓄쓄쓄쓄㻄쓄쓄럄䄀싂.뼀猀獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳獳ⱁ㩁
    Domain name hex codepoints:

    ['9ae6', '66a9', '6666', '6666', '6666', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7b73', '7373', 'c2c2', '2e', 'd400', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4fc', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', 'c4c4', '3ec4', 'c4c4', 'c4c4', 'b7c4', '4100', 'c2c2', '2e', 'bf00', '7300', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '7373', '2c41', '3a41']
    Punycode:

    xn--lkvaa9xr87caaaaaaaaaaaaaaaaaaaaaaaaaaa7968dcp2n7tvk.xn--p9mx3db62rwgjlncaaaaaaaaaaaaaaaaaaaba41m468u.xn--bfj606ben8bfnaaaaaaaaaaaaaaaaaa79563b