V4L/DVB (3312): FIX: Multiple usage of VP7045-based devices

Reassigning function pointers in a static led to infinite loops when using
multiple VP7045-based device at the same time on one system. Using kmalloc'd
copies for reassignments is better.
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/dvb-usb/vp7045-fe.c

@@ -23,10 +23,11 @@
 
 struct vp7045_fe_state {
 	struct dvb_frontend fe;
+	struct dvb_frontend_ops ops;
+
 	struct dvb_usb_device *d;
 };
 
-
 static int vp7045_fe_read_status(struct dvb_frontend* fe, fe_status_t *status)
 {
 	struct vp7045_fe_state *state = fe->demodulator_priv;
@@ -150,7 +151,8 @@ struct dvb_frontend * vp7045_fe_attach(struct dvb_usb_device *d)
 		goto error;
 
 	s->d = d;
-	s->fe.ops = &vp7045_fe_ops;
+	memcpy(&s->ops, &vp7045_fe_ops, sizeof(struct dvb_frontend_ops));
+	s->fe.ops = &s->ops;
 	s->fe.demodulator_priv = s;
 
 	goto success;