Small refactoring of FileError. NFC.

Differential revision: https://reviews.llvm.org/D57945

llvm-svn: 353679
diff --git a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
index 72774ec..fdf1c30 100644
--- a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
+++ b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
@@ -52,11 +52,6 @@
 // The name this program was invoked as.
 StringRef ToolName;
 
-Error createError(StringRef File, std::error_code EC) {
-  assert(EC);  
-  return createFileError(File, make_error<StringError>(EC));
-}
-
 LLVM_ATTRIBUTE_NORETURN void error(Twine Message) {
   WithColor::error(errs(), ToolName) << Message << ".\n";
   errs().flush();
@@ -74,7 +69,8 @@
 }
 
 LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, std::error_code EC) {
-  error(createError(File, EC));
+  assert(EC);
+  error(createFileError(File, EC));
 }
 
 LLVM_ATTRIBUTE_NORETURN void reportError(StringRef File, Error E) {