kern/54917: pad(4) has a memory leak

[isaki%pastel-flower.jp@localhost]

>Number:         54917
>Category:       kern
>Synopsis:       pad(4) has a memory leak
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 02 05:10:00 +0000 2020
>Originator:     Tetsuya Isaki
>Release:        NetBSD-current(20191128)
>Organization:
>Environment:
>Description:
Since pad(4) supports cloning in 8.99.1,
cdev_pad_open() allocates cfdata_t for cloning, but no one
deallocates it.

>How-To-Repeat:
N/A
(found by source code review)
>Fix:
N/A