[Nouveau] [bug report] drm/nouveau/gsp/r535: add support for booting GSP-RM

[Dan Carpenter]

Hello Ben Skeggs,

The patch 176fdcbddfd2: "drm/nouveau/gsp/r535: add support for
booting GSP-RM" from Sep 19, 2023 (linux-next), leads to the
following Smatch static checker warning:

	drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:1016 r535_gsp_rpc_unloading_guest_driver()
	warn: 'rpc' isn't an ERR_PTR

drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c
    1010 static int
    1011 r535_gsp_rpc_unloading_guest_driver(struct nvkm_gsp *gsp, bool suspend)
    1012 {
    1013         rpc_unloading_guest_driver_v1F_07 *rpc;
    1014 
    1015         rpc = nvkm_gsp_rpc_get(gsp, NV_VGPU_MSG_FUNCTION_UNLOADING_GUEST_DRIVER, sizeof(*rpc));

nvkm_gsp_rpc_get() returns NULL on error.

--> 1016         if (IS_ERR(rpc))
    1017                 return PTR_ERR(rpc);
    1018 
    1019         if (suspend) {
    1020                 rpc->bInPMTransition = 1;
    1021                 rpc->bGc6Entering = 0;
    1022                 rpc->newLevel = NV2080_CTRL_GPU_SET_POWER_STATE_GPU_LEVEL_3;
    1023         } else {
    1024                 rpc->bInPMTransition = 0;
    1025                 rpc->bGc6Entering = 0;
    1026                 rpc->newLevel = NV2080_CTRL_GPU_SET_POWER_STATE_GPU_LEVEL_0;
    1027         }
    1028 
    1029         return nvkm_gsp_rpc_wr(gsp, rpc, true);
    1030 }

regards,
dan carpenter