bug#40665: 28.0.50; tls hang on local ssl

[Derek Zhou]

Robert Pluim writes:

> One change we could make is to set p->gnutls_boot_parameters to nil
> here, so that in the sequence
>
>     Fgnutls_boot, handshake does not complete
>     handshake succeeds first time in wait_reading_process_output
>     delete_write_fd then checks p->gnutls_boot_parameters
>
> the sentinel ends up getting run, but Iʼve not seen the handshake ever
> succeed straight away before the delete_write_fd, and if it ever has
> in the wild we would have seen bug reports (and this is dragon-filled
> code, so I donʼt want to make changes to it if I can help it :-))
>
> In short: I think the change is ok. It passes the network-stream
> tests, so Iʼll run with it for a while, and push it in a week or so.

Will be glad to test anything on this issue. Just let me know
if you pushed any change.

Derek