Possible Memory Leak in get_device_id.c example

[Omakas]

When running the example from get_device_id.c, I see the heap from WolfSSL not go to 0 as expected. (Due to the deviceCert not being freed upon function competition)

Below is what I see for WolfSSL heap usage after the function returns when monitoring heap usage.

Name                         Usage (bytes)
 ==========================================
 Heap: libwolfssl             3513
 ---------------------------- -------------

I believe the following code needs to be added in the function to release the memory for the cert. (Doing this call I saw the heap usage from WolfSSL go to 0 after the function call)

    if (deviceCert != NULL)
    {
        wolfSSL_X509_free(deviceCert);
    }

Not sure if it would be best in the cleanup or somewhere else. (If added to the cleanup tag, than more code changes are required) But I think maybe it would be best to add it to the cleanup since the checks force the code to go to cleanup upon error.

[gtrevi]

@Omakas, thanks for bringing this to our attention. Your feedback has been shared internally for further review.

[gtrevi]

Closing - addressed in PR #236.