impurecord.c: corrected small bug in remove_impucontact_from_list()

Pre-Submission Checklist

• Commit message has the format required by CONTRIBUTING guide
• Commits are split per component (core, individual modules, libs, utils, ...)
• Each component has a single commit (if not, squash them into one commit)
• 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

• 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:

• PR should be backported to stable branches
• Tested changes locally against Version 5.1.0
• Related to issue #XXXX (replace XXXX with an open issue number)

Description

corrected 2 small bugs in function remove_impucontact_from_list:
nullify tail->next if tail removed
in remove mid-list the pointer to previous contact was not set correctly

These issues were brought up by https://github.com/thulasizwe-n at another pull request:
#1547 (comment)

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

  https://github.com/kamailio/kamailio/pull/1562

Commit Summary

• ims_usrloc_scscf:bugfix erraneous unlinking of deleted contact

File Changes

• M src/modules/ims_usrloc_scscf/impurecord.c (3)

Patch Links:

• https://github.com/kamailio/kamailio/pull/1562.patch
• https://github.com/kamailio/kamailio/pull/1562.diff

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