ringbuf: fix chr_write return value
It should return the number of written bytes. Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20161022095318.17775-4-marcandre.lureau@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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