HandlerMethod skips interface parameter introspection for return value

Fixes #22303

spring-web/src/main/java/org/springframework/web/method/HandlerMethod.java

@@ -480,8 +480,9 @@ public class HandlerMethod {
 			Annotation[] anns = this.combinedAnnotations;
 			if (anns == null) {
 				anns = super.getParameterAnnotations();
-				for (Annotation[][] ifcAnns : getInterfaceParameterAnnotations()) {
 				int index = getParameterIndex();
+				if (index >= 0) {
+					for (Annotation[][] ifcAnns : getInterfaceParameterAnnotations()) {
 						if (index < ifcAnns.length) {
 							Annotation[] paramAnns = ifcAnns[index];
 							if (paramAnns.length > 0) {
@@ -503,6 +504,7 @@ public class HandlerMethod {
 							}
 						}
 					}
+				}
 				this.combinedAnnotations = anns;
 			}
 			return anns;