[bluez/bluez] 35947e: monitor/att: Fix crash when accessing packet_conn

[Luiz Augusto von Dentz <noreply@xxxxxxxxxx>]

  Branch: refs/heads/master
  Home:   https://github.com/bluez/bluez
  Commit: 35947e26771c89d965aec5ad059267bb8c15298e
      https://github.com/bluez/bluez/commit/35947e26771c89d965aec5ad059267bb8c15298e
  Author: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
  Date:   2022-12-02 (Fri, 02 Dec 2022)

  Changed paths:
    M monitor/att.c

  Log Message:
  -----------
  monitor/att: Fix crash when accessing packet_conn

This fixes the following crash:

:monitor/att.c:2697:11: runtime error: member access within null
pointer of type 'struct att_conn_data'