hg: jdk/submit: Move declaration of 'fd'

[suenaga at oss.nttdata.com]

Changeset: 8a88bad32c93
Author:    ysuenaga
Date:      2019-12-26 10:32 +0900
URL:       https://hg.openjdk.java.net/jdk/submit/rev/8a88bad32c93

Move declaration of 'fd'

! src/hotspot/os/posix/os_posix.cpp