RFR: 8259956: jdk.jfr.internal.ChunkInputStream#available should return the sum of remaining available bytes [v6]

[Denghui Dong]

> Could I have a review of this small fix?
> 
> In the current implementation, ChunkInputStream#available only returns the available size of the current stream, which is strange for the user.

Denghui Dong has updated the pull request incrementally with one additional commit since the last revision:

  Clean up

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2138/files
  - new: https://git.openjdk.java.net/jdk/pull/2138/files/0990076a..af34d74d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2138&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2138&range=04-05

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2138.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2138/head:pull/2138

PR: https://git.openjdk.java.net/jdk/pull/2138