Infinite loop during mirror

[t-8ch]

Since 0cbe151 lftp hangs with 100% load on one core while trying to do a mirror.

Perf report:

    19.16%     lftp  lftp               [.] SFtpListInfo::Do()
    14.99%     lftp  lftp               [.] Buffer::Size() const
    13.57%     lftp  lftp               [.] xstring::length() const
    10.81%     lftp  lftp               [.] Buffer::Get(char const**, int*) const
     9.55%     lftp  lftp               [.] Buffer::Get() const
     8.31%     lftp  lftp               [.] Ref<IOBuffer>::operator->() const
     7.43%     lftp  lftp               [.] xstring0::operator char const*() const
     6.46%     lftp  lftp               [.] Buffer::Error() const
     4.32%     lftp  lftp               [.] SMTask::Roll(SMTask*)
     2.63%     lftp  lftp               [.] Ref<FileSet>::operator FileSet const*() const
     2.43%     lftp  lftp               [.] Ref<IOBuffer>::operator IOBuffer const*() const
# x < 1%

Downstream report:
https://bugs.archlinux.org/index.php?do=details&task_id=35456

[lavv17]

Should be fixed in f8ee088, please test

[t-8ch]

Works, thanks!

[bchallenor]

D'oh, I also just ran into this issue on cygwin lftp 4.4.7-1. I'll have to downgrade to 4.4.4-1 for the moment. Thanks for fixing it.