Add casts to avoid a bunch of unused expr warnings. (They aren't reported right now due to a bug that I intend to fix). Ted, please review.

llvm-svn: 77630
diff --git a/clang/test/Analysis/array-struct.c b/clang/test/Analysis/array-struct.c
index ba6781e..d6b6076 100644
--- a/clang/test/Analysis/array-struct.c
+++ b/clang/test/Analysis/array-struct.c
@@ -143,7 +143,7 @@
   int a[10];
   bar(a);
   if (a[1]) // no-warning
-    1;
+    (void)1;
 }
 
 struct s3 p[1];