Simplify ObjectFile::GetUUID

instead of returning the UUID through by-ref argument and a boolean
value indicating success, we can just return it directly. Since the UUID
class already has an invalid state, it can be used to denote the failure
without the additional bool.

llvm-svn: 353714

lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp

@@ -837,7 +837,7 @@ void ObjectFilePECOFF::CreateSections(SectionList &unified_section_list) {
   }
 }
 
-bool ObjectFilePECOFF::GetUUID(UUID *uuid) { return false; }
+UUID ObjectFilePECOFF::GetUUID() { return UUID(); }
 
 uint32_t ObjectFilePECOFF::ParseDependentModules() {
   ModuleSP module_sp(GetModule());