Return code not propagated for TLD download failure

[jdiner]

TLD updates aren't working today (2016-12-22). Error message "(connect) Cannot connect outside.". Caused by connections being rejected by the server. This situation has highlighted a bug in tld.c. Function faup_tld_update() falsely returns zero (SUCCESS) if the download failed. This is because it does not check the value returned code from faup_tld_download_mozilla_list(). The code is pasted below, with the faulty marked marked with a comment:

int faup_tld_update(void)
{
char *tld_file;

tld_file = faup_datadir_file_to_write("mozilla.tlds", false);
if (tld_file) {
    faup_tld_download_mozilla_list(tld_file);      // <--- *BUG* return value ignored
    free(tld_file);
} else {
    return -1;
}

return 0;    // <-- *BUG* zero is returned even if the download failed

}