The psw misinterprets returned values ioctl

In many cases the PSW treats values returned from the `ioctl()` syscall as the error returned from the sgx driver. In reality, ioctl just returns -1 on error and sets errno.

For example:

```
int ret = ioctl(hfile, SGX_IOC_ENCLAVE_ADD_PAGES_IN_KERNEL, &addp);
if (ret) {
SE_TRACE(SE_TRACE_WARNING, "\nAdd Page - %p to %p... FAIL\n", source, target_address);
if (enclave_error != NULL)
*enclave_error = error_driver2api(ret);
```

Should be

```
int ret = ioctl(hfile, SGX_IOC_ENCLAVE_ADD_PAGES_IN_KERNEL, &addp);
if (ret) {
SE_TRACE(SE_TRACE_WARNING, "\nAdd Page - %p to %p... FAIL\n", source, target_address);
if (enclave_error != NULL)
*enclave_error = error_driver2api(errno);
```

Note that this is tested with driver currently being upstreamed in the v26 patchset