kernel: media: pvrusb2: fix memory leak in pvr_probe

In the Linux kernel, the following vulnerability has been resolved: media: pvrusb2: fix memory leak in pvrprobe The error handling code in pvr2hdwcreate forgets to unregister the v4l2 device. When pvr2hdwcreate returns back to pvr2contextcreate, it calls pvr2contextdestroy to destroy context, but...