Fix off by one error in ListByteBufferOutputStream

Author: Anders Leung

src/main/java/htsjdk/samtools/util/ListByteBufferOutputStream.java

@@ -113,7 +113,7 @@ public byte[] toByteArray() {
     public void reset() {
         currentBlock = blocks.get(0);
         nextBytePosition = 0;
-        nextBlockIndex = 0;
+        nextBlockIndex = 1;
         size = 0;
     }