[media] cx231xx: fix handling cx231xx_read_i2c_data result

Author: Andrzej Hajda <a.hajda@samsung.com>

The function can return negative value.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/assign_signed_to_unsigned.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2046107

Signed-off-by: Andrzej Hajda 
Signed-off-by: Mauro Carvalho Chehab

---
 drivers/media/usb/cx231xx/cx231xx-video.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
 
diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c b/drivers/media/usb/cx231xx/cx231xx-video.c
index 9798160..d0d8f08 100644
--- a/drivers/media/usb/cx231xx/cx231xx-video.c
+++ b/drivers/media/usb/cx231xx/cx231xx-video.c
@@ -1114,7 +1114,8 @@ int cx231xx_enum_input(struct file *file, void *priv,
 	struct cx231xx_fh *fh = priv;
 	struct cx231xx *dev = fh->dev;
 	u32 gen_stat;
-	unsigned int ret, n;
+	unsigned int n;
+	int ret;
 
 	n = i->index;
 	if (n >= MAX_CX231XX_INPUT)

[media] cx231xx: fix handling cx231xx_read_i2c_data result

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