[PATCH next] drm/nouveau: Fix error pointer dereference in r535_gsp_msgq_recv()

[Dan Carpenter]

If "rpc" is an error pointer then return directly.  Otherwise it leads
to an error pointer dereference.

Fixes: 50f290053d79 ("drm/nouveau: support handling the return of large GSP 
message")
Signed-off-by: Dan Carpenter <dan.carpen...@linaro.org>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c 
b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c
index 2075cad63805..db2602e88006 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c
@@ -348,6 +348,7 @@ r535_gsp_msgq_recv(struct nvkm_gsp *gsp, u32 gsp_rpc_len, 
int *retries)
        if (IS_ERR(buf)) {
                kvfree(info.gsp_rpc_buf);
                info.gsp_rpc_buf = NULL;
+               return buf;
        }
 
        if (expected <= max_rpc_size)
-- 
2.47.2