sipcall: do not reset medias for ended call

like SIPCall::onMediaUpdate, we should not restart medias if
the call is ended or a crash will typically happen with multi-device
where first device answer and hangup during the negotiation with
the other.

Change-Id: Ib6bd2a316c8f03ace25926fd20338d72613d0c54

src/sip/sipcall.cpp

@@ -1460,6 +1460,11 @@ SIPCall::startIceMedia()
 void
 SIPCall::onIceNegoSucceed()
 {
+    // Check if the call is already ended, so we don't need to restart medias
+    // This is typically the case in a multi-device context where one device
+    // can stop a call. So do not start medias
+    if (not inviteSession_ or inviteSession_->state == PJSIP_INV_STATE_DISCONNECTED or not sdp_)
+        return;
     // Nego succeed: move to the new media transport
     stopAllMedia();
     {
@@ -1717,7 +1722,6 @@ SIPCall::initIceMediaTransport(bool master,
                     call->onFailure(EIO);
                     return;
                 }
-
                 call->onIceNegoSucceed();
             }
         });