hg: shenandoah/jdk9/hotspot: Initialize variable to NULL, to avoid compiler warning.

[roman at kennke.org]

Changeset: e1431baed8cd
Author:    rkennke
Date:      2016-02-03 11:14 +0100
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/e1431baed8cd

Initialize variable to NULL, to avoid compiler warning.

! src/share/vm/gc/shenandoah/shenandoahHeap.inline.hpp