checkstyle errors fixed

redisson/src/main/java/org/redisson/executor/CronExpression.java

@@ -137,6 +137,7 @@ import java.util.regex.Pattern;
  * Day-of-week field "FRI-MON" is invalid,but "FRI-SUN,MON" is valid
  *
  */
+@SuppressWarnings({"AvoidInlineConditionals", "MultipleVariableDeclarations", "InnerAssignment", "UnnecessaryParentheses"})
 public class CronExpression {
 
     enum CronFieldType {