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>
                                AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
        }
 #else
-       dm->backlight_min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
-       dm->backlight_max_input_signal = AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
+       dm->backlight_caps.min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
+       dm->backlight_caps.max_input_signal = AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
 #endif
 }