qxl_device duplicates the pointer to struct pci_dev, which is not
needed since we already have it in the drm_device structure.  Clean it
up.
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170127010548.27970-3-krisman@collabora.co.ukSigned-off-by: Gerd Hoffmann <kraxel@redhat.com>