Add null check before dereferencing pointer asyc

Addresses-Coverity-ID: 1397932
Signed-off-by: Gustavo A. R. Silva <garsi...@embeddedor.com>
---
 drivers/gpu/drm/nouveau/nv50_display.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nv50_display.c 
b/drivers/gpu/drm/nouveau/nv50_display.c
index a766324..052a60a 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -2107,7 +2107,8 @@ nv50_head_atomic_check(struct drm_crtc *crtc, struct 
drm_crtc_state *state)
                                        asyc->set.dither = true;
                        }
                } else {
-                       asyc->set.mask = ~0;
+                       if (asyc)
+                               asyc->set.mask = ~0;
                        asyh->set.mask = ~0;
                }
 
-- 
2.5.0

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