[quic] ngx_quic_input_handler Segmentation fault because c->udp->dgram is null

[Gao,Yan(媒体云)]

> the case you are describing is not what see in backtrace. And in
> described case connection is main quic connection which has process
> c->quic pointer set.

I only find sc->quic = qs; in ngx_quic_create_stream，and this is stream connection, not the main quic connection.
How the main quic connection c->quic set?

And the local code at this position:
changeset:   8813:c37ea624c307
branch:      quic
tag:         tip
user:        Roman Arutyunyan <arut at nginx.com>
date:        Fri Jan 21 11:20:18 2022 +0300
summary:     QUIC: changed debug message.

Gao,Yan(ACG VCP)

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