tcp_input: on RST+ACK in SYN_SENT, unlock the socket mutex before
tcp_drop and leave through .drop_no_socket. tcp_drop frees the socket
and locks that mutex itself, so the network thread hung on it.
Assisted-by: Claude:claude-opus-5
Reviewed-on: KolibriOS/kolibrios#622
Reviewed-by: hidnplayr <hidnplayr@gmail.com>
Reviewed-by: Burer <burer@kolibrios.org>
Co-authored-by: Kiril Lipatov <lipatov.kiril@gmail.com>
Leency
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