rx CM Service Req: reject double use sooner

When a CM Service Req is being rejected, we should do so before changing the
state of the current conn.

Concerning multiple CM Service Requests: in fact we should store multiple
requests, but first fix the status quo of rejecting multiple requests.

Change-Id: I39209ee6662694aa054a2fc0d21eae76fb33e2f1
2 files changed