[OpenSIPS-Devel] [OpenSIPS/opensips] ec1889: Proper error handling in handle_subscribe

[Bogdan Andrei IANCU]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: ec1889638a9d43280ba1362f6108a175efd4a854
      https://github.com/OpenSIPS/opensips/commit/ec1889638a9d43280ba1362f6108a175efd4a854
  Author: Bogdan-Andrei Iancu <bogdan at opensips.org>
  Date:   2019-06-14 (Fri, 14 Jun 2019)

  Changed paths:
    M modules/presence/hash.c
    M modules/presence/hash.h
    M modules/presence/subscribe.c

  Log Message:
  -----------
  Proper error handling in handle_subscribe

1) be sure we send back a 500 reply in all error cases
2) detect the cases of subscription session overlapping (see #1722)