After r271635 mmap(2) requires either MAP_PRIVATE or MAP_SHARED
for non-anonymous mappings.

This gets 'bhyvectl --get-all' working again.

Reported by:	Anish Gupta (akgupt3@gmail.com)


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272197 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f