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drm_hwcomposer: Fix another build warning in HwcDisplay::SetPowerMode()

John Stultz requested to merge john.stultz/drm-hwcomposer:build-warning-fix into main
Building with AOSP I see:

external/drm_hwcomposer/hwc2_device/HwcDisplay.cpp:768:50: warning: format specifies type 'int' but the argument has type 'HWC2::PowerMode' [-Wformat]
  768 |       ALOGE("Incorrect power mode value (%d)\n", mode);
      |                                          ~~      ^~~~
      |                                                  static_cast<int>(

So this patch tweaks the message to use integer mode_in argument
to the function.

Change-Id: I9211733137ad194d5040a1d497b008b4c2c491dd
Signed-off-by: John Stultz <>

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