07a7b85e94
introduced in amd64 revision 1.540 and i386 revision 1.547. However, it had no harmful effects until after a recent change, r189698, on amd64. (In other words, the error is harmless in RELENG_7.) The error is triggered by the failure to allocate a pv entry for the one and only mapping in a page table page. I am addressing the error by changing pmap_copy() to abort if either pv entry allocation or page table page allocation fails. This is appropriate because the creation of mappings by pmap_copy() is optional. They are a (possible) optimization, and not a requirement. Correct a nearby whitespace error in the i386 pmap_copy(). Crash reported by: jeff@ MFC after: 6 weeks
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