tree 2b7d0dccba81e003347a4fbc3744f8179091b505
parent ed7dbeffdc1d81444ef2639c65893ebd35db63b5
author Vince Chang <vince_chang@aspeedtech.com> 1736383176 +0800
committer cosmo.chou <cosmo.chou@quantatw.com> 1740790461 +0000

transporthandler: fix ipmid crash

The ipmid crashes when the set LAN configuration command is executed,
and the journal log shows the following messages.

```
/usr/include/c++/14.2.0/optional:475: constexpr _Tp&
std::_Optional_base_impl<_Tp, _Dp>::_M_get() [with _Tp =
ipmi::transport::IfAddr<2>; _Dp =
std::_Optional_base<ipmi::transport::IfAddr<2>, false, false>]:
Assertion 'this->_M_is_engaged()' failed.
```

Add checks to ensure that the return value of getIfAddr or getIfAddr4 is
not null.

Tested:
1. Change to static source and set satatic IP
ipmitool lan set 1 ipsrc static; ipmitool lan set 1 ipaddr 10.0.0.10;
ipmitool lan set 1 netmask 255.255.255.0; ipmitool lan set 1 defgw
ipaddr 10.0.0.254

2. Check the IP Lan print.
ipmitool lan print 1

Expect the IP address and IP source address report accordingly.

Change-Id: I1ddfcf0addbed466a385b1e6b9e232154c440262
Signed-off-by: Vince Chang <vince_chang@aspeedtech.com>