drm/nouveau: fix typo in c2aa91afea5f7e7ae4530fabd37414a79c03328c

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 6bf3f714..4562f30 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -469,7 +469,7 @@
 	    !nv_encoder->dcb->dpconf.link_bw)
 		nv_encoder->dp.link_bw = DP_LINK_BW_1_62;
 
-	nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT;
+	nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK;
 	if (nv_encoder->dp.link_nr > nv_encoder->dcb->dpconf.link_nr)
 		nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;