Update tools/src/main/java/org/apache/kafka/tools/ProducerPerformance.java

Co-authored-by: refacto-visz[bot] <230139763+refacto-visz[bot]@users.noreply.github.com>

Author: visz11

tools/src/main/java/org/apache/kafka/tools/ProducerPerformance.java

@@ -125,7 +125,8 @@ record = new ProducerRecord<>(config.topicName, payload);
                 /* print final results */
                 stats.printTotal();
                 /* print steady-state stats if relevant */
-                if (steadyStateStats != null) {
+                /* print steady-state stats if warmup was configured */
+                if (config.warmupRecords > 0 && steadyStateStats != null) {
                     steadyStateStats.printTotal();
                 }
             } else {