drm/nouveau: Check backlight IDs are >= 0, not > 0
commit dc854914999d5d52ac1b31740cb0ea8d89d0372e upstream. Remember, ida IDs start at 0, not 1! Signed-off-by: NLyude Paul <lyude@redhat.com> Reviewed-by: NKarol Herbst <kherbst@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: NBen Skeggs <bskeggs@redhat.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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