media: davinci: don't override the error code

As warned by Coverity:
CID 1415211 (#1 of 1): Unused value (UNUSED_VALUE)assigned_value:
Assigning value -22 to ret here, but that stored value is
overwritten before it can be used.

On all cases where the there's a goto 'unlock_out' or 'streamof',
ret was filled with a non-sero value. It toesn't make sense to override
such error code with a videobuf_streamoff() error.

Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Acked-by: Sakari Ailus <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/platform/davinci/vpfe_capture.c

···
 unlock_out:
 	mutex_unlock(&vpfe_dev->lock);
 streamoff:
-	ret = videobuf_streamoff(&vpfe_dev->buffer_queue);
+	videobuf_streamoff(&vpfe_dev->buffer_queue);
 	return ret;
 }