hg: jdk/sandbox: 8246557: test_os_linux.cpp uses NULL instead of MAP_FAILED to check for failed mmap call

[chris.hegarty at oracle.com]

Changeset: aa9017a1f7e4
Author:    tschatzl
Date:      2020-06-05 10:44 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/aa9017a1f7e4

8246557: test_os_linux.cpp uses NULL instead of MAP_FAILED to check for failed mmap call
Reviewed-by: sjohanss, stefank

! test/hotspot/gtest/runtime/test_os_linux.cpp