Fix a typo in a diag name.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@111257 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/FrontendActions.cpp b/lib/Frontend/FrontendActions.cpp
index 08639b6..0a03ab4 100644
--- a/lib/Frontend/FrontendActions.cpp
+++ b/lib/Frontend/FrontendActions.cpp
@@ -89,7 +89,7 @@
                                                     bool &Chaining) {
   Sysroot = CI.getHeaderSearchOpts().Sysroot;
   if (CI.getFrontendOpts().RelocatablePCH && Sysroot.empty()) {
-    CI.getDiagnostics().Report(diag::err_relocatable_without_without_isysroot);
+    CI.getDiagnostics().Report(diag::err_relocatable_without_isysroot);
     return true;
   }