FSMOD-35: mod_tts_commandline core dump, temp file problem.

flush can be called several times

src/mod/asr_tts/mod_tts_commandline/mod_tts_commandline.c

@@ -187,10 +187,14 @@ static void tts_commandline_speech_flush_tts(switch_speech_handle_t *sh)
 	tts_commandline_t *info = (tts_commandline_t *) sh->private_info;
 	assert(info != NULL);
 	
+	if (info->fh != NULL && info->fh->file_interface != NULL) {
 		switch_core_file_close(info->fh);
+	}
+	if (switch_file_exists(info->file, NULL) == SWITCH_STATUS_SUCCESS) {
 		if (unlink(info->file) != 0) {
 			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Sound file [%s] delete failed\n", info->file);
 		}
+	}
 }
 
 static void tts_commandline_text_param_tts(switch_speech_handle_t *sh, char *param, const char *val)