78fffdea37
The UEFI spec has a generic `Path` node representation that can be used for device path nodes that are unknown. So we can use that instead of giving up when we see a node other than FilePath. This also simplifies the FilePath case by just using xasprintf(). The code is really just a fallback for silly firmware that does not implement EFI_DEVICE_PATH_TO_TEXT_PROTOCOL (looking at you, Apple). The correctness of this was tested by round-tripping it through EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL, which yielded an identical device compared to our input path.
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