Fix coredump on async method during validatePrivilege

PATCH may cause bmcweb to coredump depending on timing
of  `validatePrivilege` execution. It is because `req' is captured as
reference, and it may be cleared-up before async-call method completes.
(This problem can be seen more frequently by enabling debug mode).

This commit is to keep `req` during to async-method execution.

Tested:

- Create a ReadOnly user - here, called as `readonly`

- Using `redfishtool`, run PATCH on `readonly` user role.

```
$ redfishtool  -vvvvv raw -r ${bmc}:18080 -u ${user} -p ${password} -S Always PATCH /redfish/v1/AccountService/Accounts/readonly --data='{"RoleId":"Administrator"}'
...
This sometimes fails because bmcweb coredump
```

After:

```
$ redfishtool  raw -r ${bmc}:18080 -u ${user} -p ${password} -S Always PATCH /redfish/v1/AccountService/Accounts/readonly --data='{"RoleId":"Administrator"}'
{
    "@odata.id": "/redfish/v1/AccountService/Accounts/readonly",
    "@odata.type": "#ManagerAccount.v1_7_0.ManagerAccount",
    ...
}
```

Change-Id: I2a28d1743cfc0fbd9239f69dec5584b34c7ebe43
Signed-off-by: Myung Bae <myungbae@us.ibm.com>

0 files changed, 0 insertions, 0 deletions