[jdk11u-dev] RFR: 8268361: Fix the infinite loop in next_line

[Jan Kratochvil]

There was a backport of the JDK-18 fix to JDK-13, JDK-15 and JDK-17.

**Issues**

    [JDK-8268361](https://bugs.openjdk.org/browse/JDK-8268361): Fix the infinite loop in next_line

I am not yet an Author - I do not have JBS account.

I have run the testsuite on linux64 and there is no change of the results. There is no new testcase for this fix and I did not do any extra testing of the fix.

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Commit messages:
 - 8268361: Fix the infinite loop in next_line

Changes: https://git.openjdk.org/jdk11u-dev/pull/1508/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1508&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8268361
  Stats: 15 lines in 1 file changed: 11 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1508.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1508/head:pull/1508

PR: https://git.openjdk.org/jdk11u-dev/pull/1508