Return an ErrorOr<Binary *> from createBinary.

I did write a version returning ErrorOr<OwningPtr<Binary> >, but it is too
cumbersome to use without std::move. I will keep the patch locally and submit
when we switch to c++11.

llvm-svn: 199326
diff --git a/llvm/tools/llvm-objdump/llvm-objdump.cpp b/llvm/tools/llvm-objdump/llvm-objdump.cpp
index 9bc092e..ba21ab1 100644
--- a/llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ b/llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -833,11 +833,12 @@
   }
 
   // Attempt to open the binary.
-  OwningPtr<Binary> binary;
-  if (error_code ec = createBinary(file, binary)) {
-    errs() << ToolName << ": '" << file << "': " << ec.message() << ".\n";
+  ErrorOr<Binary *> BinaryOrErr = createBinary(file);
+  if (error_code EC = BinaryOrErr.getError()) {
+    errs() << ToolName << ": '" << file << "': " << EC.message() << ".\n";
     return;
   }
+  OwningPtr<Binary> binary(BinaryOrErr.get());
 
   if (Archive *a = dyn_cast<Archive>(binary.get()))
     DumpArchive(a);