[Bug 239142] pthread_set_name_np no longer allows NULL to clear the thread name

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239142

            Bug ID: 239142
           Summary: pthread_set_name_np no longer allows NULL to clear the
                    thread name
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: threads
          Assignee: threads at FreeBSD.org
          Reporter: lew at perftech.com

pthread_set_name_np() previously allowed a NULL pointer to clear the thread
name.

In FreeBSD 12.0, the library will dereference the null pointer, leading to a
segment violation.

In /usr/src/lib/libthr/thread/thr_info.c, we have:

static void
thr_set_name_np(struct pthread *thread, const char *name)
{

        free(thread->name);
        thread->name = strdup(name);
}

The last line of the function should more correctly be:

        thread->name = name ? strdup(name) : NULL;

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