Convert FileOutputBuffer::commit to Error.

llvm-svn: 317656
diff --git a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
index b6fef6f..c923f90 100644
--- a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
+++ b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
@@ -121,8 +121,8 @@
   else
     Buffer = std::move(*BufferOrErr);
   Obj.write(*Buffer);
-  if (auto EC = Buffer->commit())
-    reportError(File, EC);
+  if (auto E = Buffer->commit())
+    reportError(File, errorToErrorCode(std::move(E)));
 }
 
 template <class ELFT>