drm/nouveau/device: fix changing endianess code to work on older GPUs
With this we try to detect if the endianess switch works and assume LE if not. Suggested by Ben. Fixes: 51c05340 ("drm/nouveau/device: detect if changing endianness failed") Signed-off-by: NKarol Herbst <kherbst@redhat.com> Cc: <stable@vger.kernel.org> # v5.8+ Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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