bhyve 20150316 crashed

[Willem Jan Withagen]

Assertion failed: (err == 0), function pci_vtblk_proc, file
/usr/srcs/src11/src/usr.sbin/bhyve/pci_virtio_block.c, line 276.

I noticed some work by several people on the virtio part of the tree.

This is with todays tree:
	bhyve00 11.0-CURRENT FreeBSD 11.0-CURRENT #72 r280010:
En VM crashing is an older FreeBSD-head, whilest running
	svlite up.

And err is actually 7,
type = 1

--WjW