HADOOP-18560. AvroFSInput opens a stream twice and discards the second one without closing (#5186)

This is needed for branches with  the hadoop-common changes of
HADOOP-16202. Enhanced openFile()

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/AvroFSInput.java

@@ -60,7 +60,6 @@ public class AvroFSInput implements Closeable, SeekableInput {
             FS_OPTION_OPENFILE_READ_POLICY_SEQUENTIAL)
         .withFileStatus(status)
         .build());
-    fc.open(p);
   }
 
   @Override