Those cross-references were generating an error:
*** Warning: "cpia_pp_init" [/home/v4l/master/v4l/cpia.ko] undefined!
*** Warning: "cpia_usb/_init" [/home/v4l/master/v4l/cpia.ko] undefined!
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>