drm/nouveau/gr/fuc: Store $r0 in interrupt handler
It's supposed to always be 0, but at least nv_iowr() temporarily violates this. Since the ih touches $r0, it should be stored. Signed-off-by: NRoy Spliet <rs855@cam.ac.uk> Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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