time-of-check, time-of-use race condition

Team,

File: libsmbios/blob/master/src/libsmbios_c/smi/smi_linux.c#L307

```
int __hidden wmi_supported()
{
if (access(wmi_char, F_OK) != -1)
return 1;
return 0;
}
```

I believe this indicates a security flaw, If an attacker can change anything along the path between the call `access()` and the files actually used, attacker may exploit the race condition or a time-of-check, time-of-use race condition, request team to please have a look and validate.

Reference: https://linux.die.net/man/2/access

Read libsmbios/blob/master/src/libsmbios_c/smi/smi_linux.c around line 307 and review the access(2) reference. Determine whether wmi_supported() creates an exploitable check/use race in this code path; done means the security concern is validated or dismissed and an agreed remediation scope is recorded.

Written by the indexing model from the issue text.