Fix TLS_connect() and UTIL_next_item(), add UTIL_first_item()

[DDvO]

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[Copilot]

Pull Request Overview

This PR fixes issues in TLS_connect() and UTIL_next_item(), and adds a new UTIL_first_item() utility function for parsing comma/whitespace-separated strings.

Key changes:

• Fixes logic bug in UTIL_next_item() loop condition that could cause incorrect parsing
• Adds error handling in TLS_connect() to suppress OpenSSL errors when checking for IP addresses
• Introduces UTIL_first_item() function to find the first item in a separated string

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/libsecutils/src/util/util.c	Implements UTIL_first_item() and fixes UTIL_next_item() loop condition and separator handling
src/libsecutils/src/connections/tls.c	Adds error mark handling around X509_VERIFY_PARAM_get1_ip_asc() call
src/libsecutils/include/secutils/util/util.h	Adds function declaration for UTIL_first_item() and dummy macros for older OpenSSL versions

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