vdi: do not create useless iovecs
Reads and writes to the underlying file can also occur with the simple non-vectored I/O interfaces. Acked-by: NStefan Weil <sw@weilnetz.de> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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