Actually un-xfail the test for put in fns.

Author: msullivan

src/test/compile-fail/put-in-fn.rs

@@ -1,6 +1,3 @@
-// xfail-stage1
-// xfail-stage2
-// xfail-stage3
 // error-pattern:put in non-iterator
 
 fn f() -> int { put 10; }