rx: Make rxevent_Put NULL the event ptr being put
Change rxevent_Put so that it takes a pointer to the event being
put, and NULLs that pointer. This removes a lot of duplicate code
in callers, as well as making it harder to reuse a discarded event.
Change-Id: Ib7a51f01687e08ea3dced5932ec9ec27797a784a
Reviewed-on: http://gerrit.openafs.org/8540
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>