Simplify test a bit now that it's not actually running cc1plus.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154018 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Driver/apple-kext-i386.cpp b/test/Driver/apple-kext-i386.cpp
index a09d6a6..c11a136 100644
--- a/test/Driver/apple-kext-i386.cpp
+++ b/test/Driver/apple-kext-i386.cpp
@@ -43,8 +43,7 @@
 
 // Check that --serialize-diagnostics does not cause an "argument unused" error.
 // RUN: %clang -target i386-apple-darwin10 \
-// RUN:   -Werror -Wall -Wno-comment -fapple-kext -### \
-// RUN:   --serialize-diagnostics %t.dia -c %s 2>&1 | \
+// RUN:   -Wall -fapple-kext -### --serialize-diagnostics %t.dia -c %s 2>&1 | \
 // RUN:   FileCheck --check-prefix=CHECK-UNUSED %s
 
 // CHECK-UNUSED-NOT: argument unused