Alex Langford fd5748cb5a [lldb][NFCI] Minor cleanup of default OptionValue::GetSubValue implementation
This does 2 things:
- Corrects a minor typo (`value subvalue` -> `valid subvalue`)
- Removes an unnecessary instance of `str().c_str()` (creating a
  temporary std::string from a StringRef just to get a valid
  null-terminated string).

Differential Revision: https://reviews.llvm.org/D154387
2023-07-05 09:00:59 -07:00
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