nouveau/nvkm/subdev/devinit/mcp89.c:Unneeded variable

disable,delete disable and return 0
Signed-off-by: Ntangchunyou <tangchunyou@yulong.com>
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
Reviewed-by: NKarol Herbst <kherbst@redhat.com>
Signed-off-by: NKarol Herbst <kherbst@redhat.com>
Link: https://gitlab.freedesktop.org/drm/nouveau/-/merge_requests/10

drivers/gpu/drm/nouveau/nvkm/subdev/devinit/mcp89.c

@@ -32,7 +32,6 @@ mcp89_devinit_disable(struct nvkm_devinit *init)
 	struct nvkm_device *device = init->subdev.device;
 	u32 r001540 = nvkm_rd32(device, 0x001540);
 	u32 r00154c = nvkm_rd32(device, 0x00154c);
-	u64 disable = 0;
 
 	if (!(r001540 & 0x40000000)) {
 		nvkm_subdev_disable(device, NVKM_ENGINE_MSPDEC, 0);
@@ -48,7 +47,7 @@ mcp89_devinit_disable(struct nvkm_devinit *init)
 	if (!(r00154c & 0x00000200))
 		nvkm_subdev_disable(device, NVKM_ENGINE_CE, 0);
 
-	return disable;
+	return 0;
 }
 
 static const struct nvkm_devinit_func