[media] saa7164: fix a warning at some printk's on i386

drivers/media/video/saa7164/saa7164-buffer.c: In function ‘saa7164_buffer_display’:
drivers/media/video/saa7164/saa7164-buffer.c:76: warning: cast to pointer from integer of different size
drivers/media/video/saa7164/saa7164-buffer.c:78: warning: cast to pointer from integer of different size

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>