[staging:staging-testing 231/445] vbox_fb.c:undefined reference to `fb_deferred_io_cleanup'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git staging-testing
head:   59b5306d1db0b53e39a676643b9781ba35813bb4
commit: 01d79e9b6afd15c3d2f34b39a9a6a08b45440d01 [231/445] staging: vboxvideo: Call fb_deferred_io_cleanup() on cleanup
config: x86_64-randconfig-r0-08311415 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 01d79e9b6afd15c3d2f34b39a9a6a08b45440d01
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/staging/vboxvideo/vbox_fb.o: In function `vbox_fbdev_fini':
>> vbox_fb.c:(.text+0x36): undefined reference to `fb_deferred_io_cleanup'

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