[Bug 221846] [regression] panic after r313351 due to NULL pointer dereference

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221846

            Bug ID: 221846
           Summary: [regression] panic after r313351 due to NULL pointer
                    dereference
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: eugen at freebsd.org
          Keywords: regression

The revision https://svnweb.freebsd.org/base?view=revision&revision=313351
replaced ``if (h == NULL) return'' with KASSERT for ``h != NULL''.

Now "graid label" shell command that leads to
``root_mount_rel(mdi->mdio_rootmount)'' call with NULL argument making kernel
panic due to ``LIST_REMOVE(h, list)'' in the root_mount_rel() code.

This needs to be fixed somehow.

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