xen/hvc: only notify if we actually sent something
Don't spam dom0/xenconsoled with events unless we've actually added
something to the ring.
Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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Don't spam dom0/xenconsoled with events unless we've actually added
something to the ring.
Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>