[PATCH 6/7] nouveau/gsp/rm: cleanup WARN_ON(IS_ERR_OR_NULL)

[Hongling Zeng]

Replace WARN_ON(IS_ERR_OR_NULL()) with WARN_ON(IS_ERR()) in various
[?4mM files. The underlying functions return error pointers, so
checking for NULL is redundant.

The underlying nvkm_gsp_rpc_get() function is documented to return
error pointers only, never NULL (as per kernel-doc comment added in
previous patch).

This affects:
- r535_bar1_fini() in bar.c

Signed-off-by: Hongling Zeng <zenghongling@xxxxxxxxxx>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/bar.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/bar.c b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/bar.c
index fae08ac3b18c..9cd68f8622d3 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/bar.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/bar.c
@@ -55,7 +55,7 @@ r535_bar_bar2_update_pde(struct nvkm_gsp *gsp, u8 page_shift, u64 pdbe)
 	rpc_update_bar_pde_v15_00 *rpc;
 
 	rpc = nvkm_gsp_rpc_get(gsp, NV_VGPU_MSG_FUNCTION_UPDATE_BAR_PDE, sizeof(*rpc));
-	if (WARN_ON(IS_ERR_OR_NULL(rpc)))
+	if (WARN_ON(IS_ERR(rpc)))
 		return -EIO;
 
 	rpc->info.barType = NV_RPC_UPDATE_PDE_BAR_2;
-- 
2.25.1