remote: fix odd comma operator

Commit 1882c0bd accidentally used ',' instead of ';'; oddly
enough, the result was still syntactically valid (yes, C is
a fun language).  But it made me do a double take; it's better
to use idiomatic syntax.

* daemon/remote.c (remoteRelayDomainEventDeviceAdded): Fix
harmless typo.
Signed-off-by: NEric Blake <eblake@redhat.com>

daemon/remote.c

@@ -1068,7 +1068,7 @@ remoteRelayDomainEventDeviceAdded(virConnectPtr conn,
         return -1;
 
     make_nonnull_domain(&data.dom, dom);
-    data.callbackID = callback->callbackID,
+    data.callbackID = callback->callbackID;
 
     remoteDispatchObjectEventSend(callback->client, remoteProgram,
                                   REMOTE_PROC_DOMAIN_EVENT_CALLBACK_DEVICE_ADDED,