[clang-doc] Use llvm::createStringError and canonicalize error messages

"Bad block found.\n" -> "bad block found"

The lower cased form with no full stop or newline is more common in LLVM
tools.

Reviewed By: juliehockett

Differential Revision: https://reviews.llvm.org/D66783

llvm-svn: 370155

1 files changed, 2 insertions, 2 deletions

diff --git a/clang-tools-extra/clang-doc/tool/ClangDocMain.cpp b/clang-tools-extra/clang-doc/tool/ClangDocMain.cpp
index ecc062f0864..a674b179f13 100644
--- a/clang-tools-extra/clang-doc/tool/ClangDocMain.cpp
+++ b/clang-tools-extra/clang-doc/tool/ClangDocMain.cpp
@@ -172,8 +172,8 @@ llvm::Expected<llvm::SmallString<128>> getInfoOutputFile(StringRef Root,
   llvm::sys::path::native(Root, Path);
   llvm::sys::path::append(Path, RelativePath);
   if (CreateDirectory(Path))
-    return llvm::make_error<llvm::StringError>("Unable to create directory.\n",
-                                               llvm::inconvertibleErrorCode());
+    return llvm::createStringError(llvm::inconvertibleErrorCode(),
+                                   "failed to create directory");
   llvm::sys::path::append(Path, Name + Ext);
   return Path;
 }