Fix a typo.
I believe that this is just a typo. contentKind is Optional and set in the constructor so it's not going to be null here.
GITHUB_BREAKING_CHANGES=SoySauce.setExpectedContentKind now disallows null.
@@ -177,7 +177,7 @@ public final class SoySauceImpl implements SoySauce {
@Override
public Renderer setExpectedContentKind(ContentKind expectedContentKind) {
- checkNotNull(contentKind);
+ checkNotNull(expectedContentKind);
this.contentKindExplicitlySet = true;
this.expectedContentKind = expectedContentKind;
return this;
