migration: Consolidate return path closing code We'll start calling the await_return_path_close_on_source() function from other parts of the code, so move all of the related checks and tracepoints into it. Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Fabiano Rosas <farosas@suse.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-ID: <20230918172822.19052-7-farosas@suse.de>