block/raw-posix: use a character device if a block device is given
On NetBSD a userland process is better with the character device interface. In addition, a block device can't be opened twice; if a Xen backend opens it, qemu can't and vice-versa. Signed-off-by: NChristoph Egger <Christoph.Egger@amd.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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