[media] bttv: move fini_bttv_i2c() from bttv-input.c to bttv-i2c.c

Like init_bttv_i2c(), fini_bttv_i2c() belongs to bttv-i2c.c.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/pci/bt8xx/bttv-i2c.c

@@ -394,3 +394,11 @@ int init_bttv_i2c(struct bttv *btv)
 
 	return btv->i2c_rc;
 }
+
+int fini_bttv_i2c(struct bttv *btv)
+{
+	if (0 != btv->i2c_rc)
+		return 0;
+
+	return i2c_del_adapter(&btv->c.i2c_adap);
+}