FSMOD-67 fix fortify findings for mod_unimrcp

src/mod/asr_tts/mod_unimrcp/mod_unimrcp.c

@@ -2410,7 +2410,7 @@ static switch_status_t recog_channel_get_results(speech_channel_t *schannel, cha
 	switch_mutex_lock(schannel->mutex);
 	if (!zstr(r->result)) {
 		*result = strdup(r->result);
-		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "(%s) result:\n\n%s\n", schannel->name, *result);
+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "(%s) result:\n\n%s\n", schannel->name, *result ? *result : "");
 		r->result = NULL;
 		r->start_of_input = 0;
 	} else if (r->start_of_input) {