[sr-dev] [kamailio/kamailio] dialog: check CSeq careful with track_cseq_updates (#1552)

[Dmitri Savolainen]

to avoid null pointer access for malformed messages
#### Pre-Submission Checklist
- [x] Commit message has the format required by CONTRIBUTING guide
- [x] Commits are split per component (core, individual modules, libs, utils, ...)
- [x] Each component has a single commit (if not, squash them into one commit)
- [x] No commits to README files for modules (changes must be done to docbook files
in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change
- [x] Small bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
<!-- Go over all points below, and after creating the PR, tick the checkboxes that apply -->
- [x] PR should be backported to stable branches
- [x] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description
after adding modparam("dialog", "track_cseq_updates", 1) and getting some malformed SIP  kamailio crushed


You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1552

-- Commit Summary --

  * dialog: check CSeq careful with track_cseq_updates

-- File Changes --

    M src/modules/dialog/dlg_cseq.c (3)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1552.patch
https://github.com/kamailio/kamailio/pull/1552.diff

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