Fixes to the new pagetable page allocation code.

[C. Jayachandran]

The attached patch (also at
http://people.freebsd.org/~jchandra/for-review/pmap-alloc-page-fix.diff)
has two fixes for the new pagetable page allocation code, one to
handle NULL return from the allocating function, and another to call
VM_WAIT in cases we can wait. It also removes the variable 'req' left
over from an earlier change.

Please let me know if you have any comments...

JC.
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