V4L/DVB (10148): cx23885: unsigned cx23417_mailbox cannot be negative

Unsigned cx23417_mailbox cannot be negative
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx23885/cx23885-417.c

@@ -1027,12 +1027,13 @@ static int cx23885_initialize_codec(struct cx23885_dev *dev)
 			printk(KERN_ERR "%s() f/w load failed\n", __func__);
 			return retval;
 		}
-		dev->cx23417_mailbox = cx23885_find_mailbox(dev);
-		if (dev->cx23417_mailbox < 0) {
+		retval = cx23885_find_mailbox(dev);
+		if (retval < 0) {
 			printk(KERN_ERR "%s() mailbox < 0, error\n",
 				__func__);
 			return -1;
 		}
+		dev->cx23417_mailbox = retval;
 		retval = cx23885_api_cmd(dev, CX2341X_ENC_PING_FW, 0, 0);
 		if (retval < 0) {
 			printk(KERN_ERR