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[Why] amdgpu_dm_backlight_get_level() returns a boolean value but is assigned to a variable named 'rc' which is generally used for return codes. This can be confusing while looking at the code for other issues. [How] Drop the variable and just look directly at the return value of amdgpu_dm_backlight_get_level() in the if statement. Reviewed-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Wayne Lin <wayne.lin@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>