Fixing the checkstyle failures

Author: hemanthsavasere

fluss-client/src/test/java/org/apache/fluss/client/converter/PojoToRowConverterTest.java

@@ -861,6 +861,8 @@ public static class MixedDoubleValuesPojo {
         public Double negInfValue;
 
         public MixedDoubleValuesPojo() {}
+    }
+
     @Test
     public void testTimestampPrecision3() {
         // Test with precision 3 milliseconds