[OpenSIPS-Devel] [OpenSIPS/opensips] 0d7521: b2b_entities: don't unref UNDEFINED tm

[Răzvan Crainea]

  Branch: refs/heads/2.4
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 0d752142dd0f18bac645d7d835041ace659dd199
      https://github.com/OpenSIPS/opensips/commit/0d752142dd0f18bac645d7d835041ace659dd199
  Author: Razvan Crainea <razvan at opensips.org>
  Date:   2019-03-07 (Thu, 07 Mar 2019)

  Changed paths:
    M modules/b2b_entities/dlg.c

  Log Message:
  -----------
  b2b_entities: don't unref UNDEFINED tm

Close #1629

(cherry picked from commit e6f181e26129cf1ad64071723c0c2456bac60bb7)