minios: clear the event before calling the handler since (especially in the SMP case) the handler may make another domain send an event again, and that must not be lost.
minios: clear the event before calling the handler since (especially
in the SMP case) the handler may make another domain send an event
again, and that must not be lost.

Signed-off-by: Samuel Thibault <49a5ed162141aa1a2ad45c2f70540ac844521912@eu.citrix.com>

rowhit/xen-minios,rowhit/xen-minios,rowhit/xen-minios