Bug fix: initialize variable
Bug fix: initialize variable

Initialize boolean flag that is used to track if
the volume upload was successful (ray renderer)

git-svn-id: a0a066a1d7ce87c7a04dae20f169ad0cd8bda35d@996 04231f92-3938-0410-9931-e931ac552b4f

deskvox/deskvox,deskvox/deskvox,deskvox/deskvox,deskvox/deskvox,deskvox/deskvox