openocd: manually fix Yoda conditions

Fix the remaining Yoda conditions, detected by checkpatch but not
fixed automatically.

While there, apply minor style changes.

Change-Id: I6e1978b89c4d56a20aceaeb2b52968eb6384432a
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/6356
Tested-by: jenkins
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>
Reviewed-by: Xiang W <wxjstz@126.com>

src/helper/log.c

@@ -290,7 +290,7 @@ void log_init(void)
 	if (NULL != debug_env) {
 		int value;
 		int retval = parse_int(debug_env, &value);
-		if (ERROR_OK == retval &&
+		if (retval == ERROR_OK &&
 				debug_level >= LOG_LVL_SILENT &&
 				debug_level <= LOG_LVL_DEBUG_IO)
 				debug_level = value;