Use calloc to allocate unique visitors key and initialize buffer.
This could possibly fix the use of uninitialised value reported by
Valgrind resulting on an invalid read and therefore corrupting the
btree db files.
@@ -1885,7 +1885,7 @@ get_uniq_visitor_key (GLogItem * logitem)
s3 = strlen (ua);
/* includes terminating null */
- key = xmalloc (s1 + s2 + s3 + 3);
+ key = xcalloc (s1 + s2 + s3 + 3, sizeof (char));
memcpy (key, logitem->host, s1);
