DragonFlyBSD

The code for nfs root mounts does not use kmalloc-ed space for some vars, while
some KKASSERTs in the mentioned files only check for the supplied pointers if
they were kmalloc-ed or not.
The attached patch adds a check if the supplied pointers are not in user stack
(if they are in kernel stack) ... since kmalloc-ed space also resides in the
addresses not in user stack, maybe kva_p should be removed (is it used
anywhere else?)?
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Regards,
Rumko