nvkm test builds fail with the following error.

drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c:
        In function 'nvkm_control_mthd_pstate_info':
drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c:60:35: error:
        overflow in conversion from 'int' to '__s8' {aka 'signed char'}
                changes value from '-251' to '5'

The code builds on most architectures, but fails on parisc where ENOSYS
is defined as 251. Replace the error code with -ENODEV (-19). The actual
error code does not really matter and is not passed to userspace - it
just has to be negative.

Fixes: 7238eca4cf18 ("drm/nouveau: expose pstate selection per-power source in 
sysfs")
Signed-off-by: Guenter Roeck <li...@roeck-us.net>
---
 drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c 
b/drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c
index b0ece71aefde..ce774579c89d 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/ctrl.c
@@ -57,7 +57,7 @@ nvkm_control_mthd_pstate_info(struct nvkm_control *ctrl, void 
*data, u32 size)
                args->v0.count = 0;
                args->v0.ustate_ac = NVIF_CONTROL_PSTATE_INFO_V0_USTATE_DISABLE;
                args->v0.ustate_dc = NVIF_CONTROL_PSTATE_INFO_V0_USTATE_DISABLE;
-               args->v0.pwrsrc = -ENOSYS;
+               args->v0.pwrsrc = -ENODEV;
                args->v0.pstate = NVIF_CONTROL_PSTATE_INFO_V0_PSTATE_UNKNOWN;
        }
 
-- 
2.33.0

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