If we already had a page with pindex == 0 in the device pager object (if not already fictious) the code can panic when trying to first insert a fictious page because of the overridden pindex.
If we already had a page with pindex == 0 in the device pager object
(if not already fictious) the code can panic when trying to first insert
a fictious page because of the overridden pindex.

Fix this by applying the same spinning pattern of vm_page_rename().

Reported by:	pho

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase