esp: move get_cmd() post-DMA code to get_cmd_cb()
This will be needed to implement pseudo-DMA Signed-off-by: NLaurent Vivier <laurent@vivier.eu> Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com> Acked-by: NPaolo Bonzini <pbonzini@redhat.com> Message-Id: <20191026164546.30020-3-laurent@vivier.eu>
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