CTA-861-G section 6.9.1 Static Metadata Type 1 declares that zero values
for different groups of HDR Metadata properties are allowed, including
zero nits values for max display mastering luminance, max content light
level, max frame-average light level and min display mastering luminance.
A zero value is meant to be treated by the video sink as "undefined" /
"unknown", and handled accordingly. This is common for dynamically
generated visual content.
Therefore don't assert on some minimum nits level > 0, but only check for
a non-negative level.
Fixes: b4176393a0 ("wsi/display: Implement VK_EXT_hdr_metadata on KHR_display swapchain")
Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Autumn Ashton <misyl@froggi.es>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37880>
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