In the XAVPVIAFIELDS block there is the string written to the wrong variable.

The string is stored in _ksr_xavp_via_params.s but the lenght is stored in _ksr_xavp_via_fields.len. This breaks XAVPVIAPARAMS and XAVPVIAFIELDS.

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#### Description <!-- Describe your changes in detail --> `via_use_xavp_fields("1");` and probably `via_add_xavp_params("1");` are broken because of a typo in parsing the xavp names. The values of xavp_via_params global parameter and xavp_via_fields global parameter are not stored correctly. You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/3540

-- Commit Summary --

* core: cfg.y typo in parsing XAVPVIAFIELDS

-- File Changes --

M src/core/cfg.y (2)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3540.patch https://github.com/kamailio/kamailio/pull/3540.diff