pseudofs: fix off by one in hash iteration in pfs_purge

[weike.chen_dell.com]

Summary

Random KASSERT while rebooting, and it is due to pfs_purge doesn't clear the last hash entry as using the wrong hash size in hash table looping. 'pfs_vncache_hash + 1' is the really hash table size.

[mjg]

The patch looks correct, but commit message needs some work.

I would say the following would be sufficient: "pseudofs: fix off by one in hash iteration in pfs_purge". I can plop this much myself.

However, what about 'sponsored by' or other tags?

[weike.chen_dell.com]

In D42628#973358, @mjg wrote:

The patch looks correct, but commit message needs some work.

I would say the following would be sufficient: "pseudofs: fix off by one in hash iteration in pfs_purge". I can plop this much myself.

However, what about 'sponsored by' or other tags?

Please feel free to improve the commit message.
For Sponsor, I am working for Dell product, how about mark it to "sponsored by Dell Technologies "?