[OpenSIPS-Devel] [OpenSIPS/opensips] 1ebb8a: auth: fix a compile warning

[Vlad Pătrașcu]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 1ebb8ac3dcf5dc65c1038b7398029062bfd79aa7
      https://github.com/OpenSIPS/opensips/commit/1ebb8ac3dcf5dc65c1038b7398029062bfd79aa7
  Author: Vlad Patrascu <vladp at opensips.org>
  Date:   2019-07-22 (Mon, 22 Jul 2019)

  Changed paths:
    M modules/auth/challenge.c

  Log Message:
  -----------
  auth: fix a compile warning