[OpenSIPS-Devel] [OpenSIPS/opensips] a82199: b2b_entities: fix entity storage memory leak

[Vlad Pătrașcu]

  Branch: refs/heads/3.2
  Home:   https://github.com/OpenSIPS/opensips
  Commit: a821997cd90d9497e96567b7ffef3b00f3a371bc
      https://github.com/OpenSIPS/opensips/commit/a821997cd90d9497e96567b7ffef3b00f3a371bc
  Author: Vlad Patrascu <vladp at opensips.org>
  Date:   2022-03-15 (Tue, 15 Mar 2022)

  Changed paths:
    M modules/b2b_entities/b2be_db.c
    M modules/b2b_entities/dlg.c

  Log Message:
  -----------
  b2b_entities: fix entity storage memory leak

Do not reset the pointer to the storage buffer when there is nothing
to serialize after running the callback.

(cherry picked from commit e19ed6eaaf8d238ada6b9868760127f097412439)