HADOOP-17588. CryptoInputStream#close() should be synchronized.

Contributed by RenukaPrasad C

Change-Id: Ia0a19ccc55a67e5434f0be23a500496bc7682f40

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/CryptoInputStream.java

@@ -317,7 +317,7 @@ public class CryptoInputStream extends FilterInputStream implements
   }
   
   @Override
-  public void close() throws IOException {
+  public synchronized void close() throws IOException {
     if (closed) {
       return;
     }