drm/amd/display: Fix compile error with ACPI disabled

The fallback code for getting default backlight caps was using
the wrong variable name.  Fix it.

Fixes: https://lists.freedesktop.org/archives/dri-devel/2018-November/197752.html
Signed-off-by: David Francis <David.Francis@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
David Francis 2018-11-27 11:10:07 -05:00 • committed by Alex Deucher
commit 8bcbc9ef96