This addresses the following gcc warning with "make W=1":
drivers/gpu/drm/nouveau/dispnv50/disp.c: In function ‘nv50_mstm_prepare’:
drivers/gpu/drm/nouveau/dispnv50/disp.c:1378:6: warning:
variable ‘ret’ set but not used [-Wunused-but-set-variable]

Signed-off-by: Tian Tao <tiant...@hisilicon.com>
---
 drivers/gpu/drm/nouveau/dispnv50/disp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c 
b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index b111fe2..d05c57c 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -1379,6 +1379,9 @@ nv50_mstm_prepare(struct nv50_mstm *mstm)
 
        NV_ATOMIC(drm, "%s: mstm prepare\n", mstm->outp->base.base.name);
        ret = drm_dp_update_payload_part1(&mstm->mgr);
+       if (ret) {
+                NV_ATOMIC(drm, "failed to update payload %d\n", ret);
+        }
 
        drm_for_each_encoder(encoder, mstm->outp->base.base.dev) {
                if (encoder->encoder_type == DRM_MODE_ENCODER_DPMST) {
-- 
2.7.4

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