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drm/nouveau: Replace redundant return value judgment with PTR_ERR_OR_ZERO()
Replace redundant return value judgment with PTR_ERR_OR_ZERO() to enhance code readability. Signed-off-by:Liao Yuanhong <liaoyuanhong@vivo.com> Signed-off-by:
Lyude Paul <lyude@redhat.com> Link: https://lore.kernel.org/r/20250815133643.418089-1-liaoyuanhong@vivo.com