[Bug 238212] [Witness] Errors are reported when taking a recursive lock

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238212

            Bug ID: 238212
           Summary: [Witness] Errors are reported when taking a recursive
                    lock
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: nicolas.masse at stormshield.eu

Created attachment 204696
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=204696&action=edit
Add a check in witness to allow taking a lock recursively

When using a recursive lock, witness trigger an errors if the lock is taken
twice although it is an expected case.

This was observed when using a rm_lock created with the RM_RECURSE flag.
So I add a check in witness to check is the class of the lock have the
LC_RECURSABLE flag set before triggering the error.

Note that this is a quick fix which could probably be enhanced.

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