Removed the unused HadoopIllegalArgumentException import

Author: teamconfx

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/erasurecode/rawcoder/TestDecodingValidator.java

@@ -17,7 +17,6 @@
  */
 package org.apache.hadoop.io.erasurecode.rawcoder;
 
-import org.apache.hadoop.HadoopIllegalArgumentException;
 import org.apache.hadoop.io.erasurecode.ECChunk;
 import org.apache.hadoop.io.erasurecode.ErasureCodeNative;
 import org.apache.hadoop.test.GenericTestUtils;