drm/vc4: kms: Fix return code check
The HVS global state functions return an error pointer, but in most cases we check if it's NULL, possibly resulting in an invalid pointer dereference. Fixes: 9ec03d7f ("drm/vc4: kms: Wait on previous FIFO users before a commit") Signed-off-by:Maxime Ripard <maxime@cerno.tech> Reviewed-by:
Dave Stevenson <dave.stevenson@raspberrypi.com> Tested-by:
Jian-Hong Pan <jhp@endlessos.org> Link: https://lore.kernel.org/r/20211117094527.146275-3-maxime@cerno.tech
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