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libplacebo: display: use array for planes

Alexandre Janniaux requested to merge alexandre-janniaux/vlc:libplacebo-warning/1 into master

vlc_placebo_PlaneData is expecting an array of four elements. Not complying to this results in the following warning, even if the code is not making use of the other planes.

../../modules/video_output/libplacebo/display.c:369:18: warning: ‘vlc_placebo_PlaneData’ accessing 480 bytes in a region of size 120 [-Wstringop-overflow=]
  369 |             if (!vlc_placebo_PlaneData(r->p_picture, &subdata, NULL))
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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