RFR: JDK-8294702 - BufferedInputStream uses undefined value range for markpos [v2]

[Markus KARG]

> Fixes JDK-8294702

Markus KARG has updated the pull request incrementally with one additional commit since the last revision:

  Modified to < 0 as proposed by Alan Batement

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10528/files
  - new: https://git.openjdk.org/jdk/pull/10528/files/9b8310ad..8fefccfc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10528&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10528&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10528.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10528/head:pull/10528

PR: https://git.openjdk.org/jdk/pull/10528