PROBLEM: bug at ./drivers/media/video/hdpvr/hdpvr-core.c

[iceberg <strakh@ispras.ru>]

	KERNEL_V	ERSION: 2.6.30	
	SUBJECT:  in function device_authorization mutex is not released on error 
path.
	DESCRIBE:
	In ./drivers/media/video/hdpvr/hdpvr-core.c in function device_authorization: 
	If after mutex lock (line 4) usb_control_msg returns ret!=46 we go to label 
error. In this case before exit from function mutex must be 	unlocked.

01) static int device_authorization(struct hdpvr_device *dev)
02) {
03) ............
04)         mutex_lock(&dev->usbc_mutex);                                                    
05)        ret = usb_control_msg(dev->udev,
06)                               usb_rcvctrlpipe(dev->udev, 0),
07)                              rcv_request, 0x80 | request_type,
08)                              0x0400, 0x0003,
09)                              dev->usbc_buf, 46,10000);
10)	        if (ret != 46) {
11)              v4l2_err(&dev->v4l2_dev,
12)                         "unexpected answer of status request, len %d\n", 
ret);
13)                goto error;
14)        }
15) .................
16) error:
17)
18)        return retval;
19) }