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allocation routines are being called safely. Since we drop our relevant mbuf mutex and acquire Giant before we call kmem_malloc(), we have to make sure that this does not pave the way for a fatal lock order reversal. Check that either Giant is already held (in which case it's safe to grab it again and recurse on it) or, if Giant is not held, that no other locks are held before we try to acquire Giant. Similarily, add a KASSERT valid in the WITNESS case in m_reclaim() to nail callers who end up in m_reclaim() and hold a lock. Pointed out by: jhb
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