Set the valid field of the newly allocated field as all other vm page allocators do. This fixes a panic when a virtio block device is mounted as root, with the host system dying in vm_page_dirty with invalid bits.
Set the valid field of the newly allocated field as all other
vm page allocators do. This fixes a panic when a virtio block
device is mounted as root, with the host system dying in
vm_page_dirty with invalid bits.

Reviewed by:	neel
Obtained from:	NetApp

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