[fixes #2682] Fix NPE, always add Javadoc return statement

test/transform/resource/after-ecj/JacksonizedSuperBuilderWithJsonDeserialize.java

@@ -6,6 +6,9 @@ public @lombok.extern.jackson.Jacksonized @lombok.experimental.SuperBuilder @com
     }
     protected abstract @java.lang.SuppressWarnings("all") B self();
     public abstract @java.lang.SuppressWarnings("all") C build();
+    /**
+     * @return {@code this}.
+     */
     public @java.lang.SuppressWarnings("all") B field1(final int field1) {
       this.field1 = field1;
       return self();