[media] af9035: unlock on error in af9035_i2c_master_xfer()

We introduced a couple new error paths which are missing unlocks.
Fixes: 7760e148 ('[media] af9035: Don't use dynamic static allocation')
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
Cc: stable@vger.kernel.org

drivers/media/usb/dvb-usb-v2/af9035.c

@@ -245,7 +245,8 @@ static int af9035_i2c_master_xfer(struct i2c_adapter *adap,
 				dev_warn(&d->udev->dev,
 					 "%s: i2c xfer: len=%d is too big!\n",
 					 KBUILD_MODNAME, msg[0].len);
-				return -EOPNOTSUPP;
+				ret = -EOPNOTSUPP;
+				goto unlock;
 			}
 			req.mbox |= ((msg[0].addr & 0x80)  >>  3);
 			buf[0] = msg[1].len;
@@ -281,7 +282,8 @@ static int af9035_i2c_master_xfer(struct i2c_adapter *adap,
 				dev_warn(&d->udev->dev,
 					 "%s: i2c xfer: len=%d is too big!\n",
 					 KBUILD_MODNAME, msg[0].len);
-				return -EOPNOTSUPP;
+				ret = -EOPNOTSUPP;
+				goto unlock;
 			}
 			req.mbox |= ((msg[0].addr & 0x80)  >>  3);
 			buf[0] = msg[0].len;
@@ -319,6 +321,7 @@ static int af9035_i2c_master_xfer(struct i2c_adapter *adap,
 		ret = -EOPNOTSUPP;
 	}
 
+unlock:
 	mutex_unlock(&d->i2c_mutex);
 
 	if (ret < 0)