kern/91996: SLIST_FOREACH_PREVPTR() macro is wrong

[Ray Lai]

>Number:         91996
>Category:       kern
>Synopsis:       SLIST_FOREACH_PREVPTR() macro is wrong
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jan 19 14:00:11 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Ray Lai
>Release:        HEAD
>Organization:
>Environment:
>Description:
The SLIST_FOREACH_PREVPTR() macro in sys/queue.h is implemented incorrectly.  See https://marc.theaimsgroup.com/?l=openbsd-tech&m=113687205623649
>How-To-Repeat:
See https://marc.theaimsgroup.com/?l=openbsd-tech&m=113687205623649
>Fix:
https://marc.theaimsgroup.com/?l=openbsd-tech&m=113687205623649
>Release-Note:
>Audit-Trail:
>Unformatted: