Codegen: Fix flipped conditional for the simple method warning log (#5558)

Co-authored-by: Brandon Dahler <[email protected]>

Author: brandondahler

codegen/src/main/java/software/amazon/awssdk/codegen/IntermediateModelBuilder.java

@@ -291,7 +291,7 @@ private void setSimpleMethods(IntermediateModel model) {
                                               config.getExcludedSimpleMethods().stream().noneMatch(m -> m.equals("*")) ||
                                               !config.getBlacklistedSimpleMethods().contains(methodName) ||
                                               config.getBlacklistedSimpleMethods().stream().noneMatch(m -> m.equals("*"));
-                boolean methodHasNoRequiredMembers = !CollectionUtils.isNullOrEmpty(inputShape.getRequired());
+                boolean methodHasNoRequiredMembers = CollectionUtils.isNullOrEmpty(inputShape.getRequired());
                 boolean methodIsNotStreaming = !operation.isStreaming();
                 boolean methodHasSimpleMethodVerb = methodName.matches(Constant.APPROVED_SIMPLE_METHOD_VERBS);