message: Use conventional spelling of always-failing assert.
  Fixes -Wstring-conversion warning that was breaking -Werror builds.
diff: @@ -342,7 +342,7 @@ void Module::SetUUID(const lldb_private::UUID &uuid) {
  m_uuid = uuid;
  m_did_set_uuid = true;
  } else {
  - lldbassert(!"Attempting to overwrite the existing module UUID");
  + lldbassert(0 && "Attempting to overwrite the existing module UUID");
  }
  }
  