V4L/DVB (9676): em28xx: fix a regression caused by 22c90ec6a5e07173ee670dc2ca75e0df0a7772c0

If removing and reiserting the driver on some devices, tuner type will
be unset at the second time. This patch fixes this issue.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/em28xx/em28xx-cards.c b/drivers/media/video/em28xx/em28xx-cards.c
index e7d69d6..5751b66 100644
--- a/drivers/media/video/em28xx/em28xx-cards.c
+++ b/drivers/media/video/em28xx/em28xx-cards.c
@@ -1801,7 +1801,8 @@
 	em28xx_set_model(dev);
 
 	dev->tuner_type = em28xx_boards[dev->model].tuner_type;
-	dev->tuner_addr = em28xx_boards[dev->model].tuner_addr;
+	if (em28xx_boards[dev->model].tuner_addr)
+		dev->tuner_addr = em28xx_boards[dev->model].tuner_addr;
 
 	/* request some modules */
 	switch (dev->model) {