[bootlin/training-materials] 9f7929: kernel: fix build failure

[Miquèl Raynal]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 9f792982ede99ee1ad08713f2fec7323109b7905
      https://github.com/bootlin/training-materials/commit/9f792982ede99ee1ad08713f2fec7323109b7905
  Author: Miquel Raynal <miquel.raynal at bootlin.com>
  Date:   2023-01-16 (Mon, 16 Jan 2023)

  Changed paths:
    A slides/kernel-hw-devices/dt-basic-syntax.dia
    A slides/kernel-hw-devices/dt-spec.png
    A slides/kernel-hw-devices/dt-to-devices.dia
    A slides/kernel-hw-devices/dts-to-dtb.dia
    M slides/kernel-hw-devices/kernel-hw-devices.tex

  Log Message:
  -----------
  kernel: fix build failure

Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>