V4L/DVB (4484): Git-dvb: cadet build fix

drivers/media/radio/radio-cadet.c: In function 'cadet_do_ioctl':
drivers/media/radio/radio-cadet.c:362: warning: implicit declaration of function 'KERNEL_VERSION'

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>