Don't allow mmapping of physical page 6 (ENXIO).
Don't allow mmapping of physical page 6 (ENXIO).

nxmmap() returned a bogus value as well as having a bogus type.  Some
drivers use nxmmap() for configured devices (`nx' functions should
only be used for unconfigured devices).  These drivers allowed mmapping
physical page 6, which may have interesting contents.  vm has kludges
to avoid the same bug with nullop() returning page 0 and enodev()
returning page 19 (ENODEV), but didn't handle enxio() returning page 6.
vm is the wrong place to handle these bugs.

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