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Revert "vm_phys_enqueue_contig: handle npages==0"

Description

Revert "vm_phys_enqueue_contig: handle npages==0"

This reverts commit 1a7fcf6d51eb67ee3e05fdbb806f7e68f9f53c9c.

Peter Holm reported a problem, so I'm reverting now and looking for
the problem later.