[jdk11u-dev] RFR: 8263718: unused-result warning happens at os_linux.cpp

[Matthias Baesken]

8263718: unused-result warning happens at os_linux.cpp

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Commit messages:
 - Backport f1d4ae6cc974912a66b96e624ee0ec46c9ec8fc2

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/1039/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1039&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263718
  Stats: 27 lines in 3 files changed: 6 ins; 20 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/1039.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/1039/head:pull/1039

PR: https://git.openjdk.java.net/jdk11u-dev/pull/1039