When writing to query_buffer with the help of the snprintf() function, the result of the functio is written to variable query_buffer_len instead of to the query_buffer.len itself. This leads to core dump in some cases. Replaced "_" by "." in "query_buffer_len ="

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#### Description <!-- Describe your changes in detail --> When linking a Contact to an IMPU during SIP REGISTER in S-CSCF, a core dump can happen due to missing assignment of length to query_buffer. Added the assignment.

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

https://github.com/kamailio/kamailio/pull/1411

-- Commit Summary --

* ims_usrloc_scscf: assignment of length missing for query_buffer in

-- File Changes --

M src/modules/ims_usrloc_scscf/usrloc_db.c (2)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1411.patch https://github.com/kamailio/kamailio/pull/1411.diff