Can't clear SEL from local interface if using a BMC as a bridge and sending command to another BMC

[AlexanderAmelkin]

Reported by: zhangxl
Original Ticket: ipmitool/bugs/502

There are 2 BMCs inter-connected with I2C bus on my project. Please refer to the attached map. Now I want to clear target BMC SEL logs. The host has booted into Linux OS. I send the command:
ipmitool -b 0 -t 0x24 sel clear
ipmitool reports "Unable to clear SEL: Reservation cancelled or invalid."
I add some debug message in BMC codes and find that it is an ipmitool issue.
ReserveSEL: reveration id = 0x9246
ReserveSEL: reveration id = 0xbd57
clear sel: RsrvIDCancelled = 0, ReservationID = 0x9246
The ipmitool sends "Reserve SEL" command twice but uses the first reservation ID which is invalid.