fix(userspace/libsinsp): ensure socket handler ares channel destroy w…

…orks even when try_resolve has not been called (#1686)

Co-authored-by: Lorenzo Fontana <lo@linux.com>
Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>

Co-authored-by: Lorenzo Fontana <lo@linux.com>

userspace/libsinsp/socket_handler.h

@@ -1616,7 +1616,7 @@ class socket_data_handler
 	http_parser_data         m_http_parser_data;
 	unsigned                 m_data_limit = 524288; // bytes
 
-	ares_channel             m_ares_channel;
+	ares_channel             m_ares_channel = nullptr;
 	ares_options             m_ares_opts;
 	ares_cb_result           m_ares_cb_res;