fixed @Nullable missing infer errors

Summary: Fixed Nullable lint errors

Reviewed By: davidaurelio

Differential Revision: D14383930

fbshipit-source-id: 0847e19c50a0b8d4039199045b74aa86c96ac096

java/com/facebook/yoga/YogaNode.java

@@ -213,6 +213,7 @@ public abstract class YogaNode {
 
   public abstract void setData(Object data);
 
+  @Nullable
   public abstract Object getData();
 
   public abstract void print();