[TextAPI][elfabi] Fix build by adding std::move() to r348735

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348736 91177308-0d34-0410-b5e6-96231b3b80d8

lib/TextAPI/ELF/TBEHandler.cpp

@@ -149,7 +149,7 @@ Expected<std::unique_ptr<ELFStub>> elfabi::readTBEFromBuffer(StringRef Buf) {
   if (std::error_code Err = YamlIn.error())
     return createStringError(Err, "YAML failed reading as TBE");
 
-  return Stub;
+  return std::move(Stub);
 }
 
 Error elfabi::writeTBEToOutputStream(raw_ostream &OS, const ELFStub &Stub) {