[bluez/bluez] 40cdfd: transport: fix A2DP Delay values missing from DBus

  Branch: refs/heads/992140
  Home:   https://github.com/bluez/bluez
  Commit: 40cdfd1c961462d3fd889521ecad078854c31d64
      https://github.com/bluez/bluez/commit/40cdfd1c961462d3fd889521ecad078854c31d64
  Author: Pauli Virtanen [off-list ref]
  Date:   2025-08-16 (Sat, 16 Aug 2025)

  Changed paths:
    M profiles/audio/transport.c

  Log Message:
  -----------
  transport: fix A2DP Delay values missing from DBus

With headsets, a2dp_transport::session == NULL usually until stream
resumes. During this time, delay_reporting_exists() incorrectly returns
FALSE, because streams corresponding to NULL session cannot be found.
As no further "Delay" property updates will usually arrive, the property
remains missing even though delay reports have been received.

Fix by setting a2dp->session when processing a delay report, if missing.

Log (bluetoothctl):
[NEW] Transport /org/bluez/hci1/dev_XX_XX_XX_XX_XX_XX/sep2/fd1
[CHG] Transport /org/bluez/hci1/dev_XX_XX_XX_XX_XX_XX/sep2/fd1 Delay is nil



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