Minor cleanup

Author: andrykonchin

spec/truffleruby.next-specs

@@ -31,7 +31,7 @@ spec/ruby/core/sizedqueue/pop_spec.rb
 spec/ruby/core/sizedqueue/shift_spec.rb
 
 spec/ruby/core/module/refinements_spec.rb
+spec/ruby/core/module/undefined_instance_methods_spec.rb
 spec/ruby/core/refinement/refined_class_spec.rb
 spec/ruby/core/module/used_refinements_spec.rb
 spec/ruby/optional/capi/hash_spec.rb
-spec/ruby/core/module/undefined_instance_methods_spec.rb

src/main/java/org/truffleruby/core/module/ModuleNodes.java

@@ -2365,7 +2365,7 @@ protected RubyArray undefinedInstanceMethods(RubyModule module) {
             List<RubySymbol> methodNames = new ArrayList<>();
 
             for (InternalMethod methodEntry : module.fields.getMethods()) {
-                if (methodEntry != null && methodEntry.isUndefined()) {
+                if (methodEntry.isUndefined()) {
                     methodNames.add(getLanguage().getSymbol(methodEntry.getName()));
                 }
             }