Fix a funny typo. Thanks to Aaron Ballman for noticing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186532 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/Windows/Path.inc

@@ -1054,7 +1054,7 @@ error_code openFileForRead(const Twine &Name, int &ResultFD) {
                            OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
   if (H == INVALID_HANDLE_VALUE) {
     error_code EC = windows_error(::GetLastError());
-    // Provide a better error massage when trying to open directories.
+    // Provide a better error message when trying to open directories.
     // This only runs if we failed to open the file, so there is probably
     // no performances issues.
     if (EC != windows_error::access_denied)