Initialize the variable to something.

--HG--
extra : convert_revision : bfe1e70130719ff239987d725b089c6d7152c541

src/unittest/cprintftest.cc

@@ -40,7 +40,7 @@ using namespace std;
 int
 main()
 {
-    char foo[9];
+    char foo[] = "foo";
     cprintf("%s\n", foo);
 
     cprintf("%d\n", 'A');