quic: free popped incoming channel on early exit in accept_connection

quic: free popped incoming channel on early exit in accept_connection

If we pop a channel but fail to extract or adopt its SSL pointer,
we return without releasing the channel. Add a small cleanup at
the function epilogue to free new_ch when conn_ssl is NULL.

Signed-off-by: Joshua Rogers <MegaManSec@users.noreply.github.com>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
MergeDate: Mon Jan 12 18:54:05 2026
(Merged from https://github.com/openssl/openssl/pull/28920)