Roger Pau Monné 06592d60f0 xen/control: short circuit xctrl_on_watch_event on spurious event
If there's no data to read from xenstore short-circuit
xctrl_on_watch_event to return early, there's no reason to continue
since the lack of data would prevent matching against any known event
type.

Sponsored by:	Citrix Systems R&D
MFC with:	r352925
MFC after:	1 week
2020-05-28 08:20:16 +00:00
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