[media] cx23885: handle errors from videobuf_dvb_get_frontend()

The error handling in the original code wasn't complete so static
checkers complained about a potential NULL deference.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/cx23885/cx23885-video.c b/drivers/media/video/cx23885/cx23885-video.c
index 4bbf9bb97bde984e23c0665fda59a72bc7dbd80a..c654bdc7ccb201dd4e285c0b7ddfe703ab89cb61 100644 (file)
--- a/drivers/media/video/cx23885/cx23885-video.c
+++ b/drivers/media/video/cx23885/cx23885-video.c
@@ -1550,7 +1550,6 @@ static int cx23885_set_freq_via_ops(struct cx23885_dev *dev,
        struct v4l2_control ctrl;
        struct videobuf_dvb_frontend *vfe;
        struct dvb_frontend *fe;
-       int err = 0;
 
        struct analog_parameters params = {
                .mode      = V4L2_TUNER_ANALOG_TV,
@@ -1572,8 +1571,10 @@ static int cx23885_set_freq_via_ops(struct cx23885_dev *dev,
                params.frequency, f->tuner, params.std);
 
        vfe = videobuf_dvb_get_frontend(&dev->ts2.frontends, 1);
-       if (!vfe)
-               err = -EINVAL;
+       if (!vfe) {
+               mutex_unlock(&dev->lock);
+               return -EINVAL;
+       }
 
        fe = vfe->dvb.frontend;