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[ Upstream commit25e6373a5b] - fix variable ('attr') dereferenced issue. - using condition check instead of BUG_ON(). Fixes:4e01847c38("drm/amdgpu: optimize amdgpu device attribute code") Cc: Dan Carpenter <dan.carpenter@linaro.org> Signed-off-by: Yang Wang <kevinyang.wang@amd.com> Reviewed-by: Kenneth Feng <kenneth.feng@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org>