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ack_timer should be cleared when sending ACK to avoid acking I-frames twice. This commit introduces helper function (only send ack, not clearing timer) which is used by l2cap_send_ack and l2cap_ack_timeout. This is to avoid clearing ack timer in timer function. Signed-off-by: Szymon Janc <szymon.janc@tieto.com> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>