Merge tag 'gvt-fixes-2019-11-12' of https://github.com/intel/gvt-linux into drm-intel-fixes

gvt-fixes-2019-11-12

- Fix dmabuf reference drop (Pan)

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
From: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191112061834.GN4196@zhen-hp.sh.intel.com