git: openjdk/jdk: 8305922: [aix,linux] Avoid comparing 'this' to nullptr

[Tyler Steele]

Changeset: 0dc03c9d
Author:    Tyler Steele <tsteele at openjdk.org>
Date:      2023-04-24 20:32:49 +0000
URL:       https://git.openjdk.org/jdk/commit/0dc03c9d544ac431a8932c4fee3f5f82b8fb64d2

8305922: [aix,linux] Avoid comparing 'this' to nullptr

Reviewed-by: mdoerr, dholmes

! src/hotspot/os/aix/osThread_aix.cpp
! src/hotspot/os/linux/osThread_linux.cpp