[OpenSIPS-Devel] [OpenSIPS/opensips] 1b4f75: presence_xml: fix typo in NULL check

[Zero King]

  Branch: refs/heads/2.4
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 1b4f75a7a1fa0a7c70d7244575c25d84ba97da88
      https://github.com/OpenSIPS/opensips/commit/1b4f75a7a1fa0a7c70d7244575c25d84ba97da88
  Author: Zero King <l2dy at icloud.com>
  Date:   2020-03-12 (Thu, 12 Mar 2020)

  Changed paths:
    M modules/presence_xml/notify_body.c

  Log Message:
  -----------
  presence_xml: fix typo in NULL check

(cherry picked from commit 7bc6526a6107cf551044468db3c855fc3af2a925)