Convert FileOutputBuffer to Expected. NFC.

llvm-svn: 317649
diff --git a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
index 5a09f8f..b6fef6f 100644
--- a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
+++ b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
@@ -113,10 +113,10 @@
 template <class ELFT>
 void WriteObjectFile(const Object<ELFT> &Obj, StringRef File) {
   std::unique_ptr<FileOutputBuffer> Buffer;
-  ErrorOr<std::unique_ptr<FileOutputBuffer>> BufferOrErr =
+  Expected<std::unique_ptr<FileOutputBuffer>> BufferOrErr =
       FileOutputBuffer::create(File, Obj.totalSize(),
                                FileOutputBuffer::F_executable);
-  if (BufferOrErr.getError())
+  if (BufferOrErr.takeError())
     error("failed to open " + OutputFilename);
   else
     Buffer = std::move(*BufferOrErr);