tests: Avoid spurious use of /dev/null.

llvm-svn: 103446
diff --git a/clang/test/CodeGenObjC/blocks-ivar-debug.m b/clang/test/CodeGenObjC/blocks-ivar-debug.m
index 92a5a72..d0cf1f1 100644
--- a/clang/test/CodeGenObjC/blocks-ivar-debug.m
+++ b/clang/test/CodeGenObjC/blocks-ivar-debug.m
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -g %s -fblocks -S -o /dev/null
+// RUN: %clang_cc1 -g %s -fblocks -S -o %t
 // Radar 7959934
 
 @interface NSObject {