hw/i386: fix vmmouse registration

According to the logic of vmmouse_update_handler function,
vmmouse should be registered as an event handler when
it's status is zero.
vmmouse_read_id resets the status but does not register
the handler.
This patch adds vmmouse registration and activation when
status is reset.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Message-Id: <163524204515.1914131.16465061981774791228.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/i386/vmmouse.c

@@ -158,6 +158,7 @@ static void vmmouse_read_id(VMMouseState *s)
 
     s->queue[s->nb_queue++] = VMMOUSE_VERSION;
     s->status = 0;
+    vmmouse_update_handler(s, s->absolute);
 }
 
 static void vmmouse_request_relative(VMMouseState *s)