qemu: blockjob: Reset 'synchronous' block job handling flag prior to flushing events

When returning to asynchronous block job handling the flag which
determines the handling method should be reset prior to flushing
outstanding events. If there's an event to process the handler may
invoke the monitor and another event may be received. We'd not process
that one. Reset the flag earlier.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_blockjob.c

@@ -821,8 +821,8 @@ qemuBlockJobSyncEnd(virDomainObjPtr vm,
         diskdst = job->disk->dst;
 
     VIR_DEBUG("disk=%s", NULLSTR(diskdst));
-    qemuBlockJobUpdate(vm, job, asyncJob);
     job->synchronous = false;
+    qemuBlockJobUpdate(vm, job, asyncJob);
 }