fix tests

Author: Jorge Aparicio

src/test/compile-fail/unboxed-closures-type-mismatch.rs

@@ -14,6 +14,6 @@ use std::ops::FnMut;
 
 pub fn main() {
     let mut f = |&mut: x: int, y: int| -> int { x + y };
-    let z = f(1u, 2);    //~ ERROR type mismatch
+    let z = f(1u, 2);    //~ ERROR mismatched types
     println!("{}", z);
 }

src/test/run-pass/overloaded-calls-object-zero-args.rs

@@ -11,11 +11,11 @@
 // Tests calls to closure arguments where the closure takes 0 arguments.
 // This is a bit tricky due to rust-call ABI.
 
-fn foo(f: &mut FnMut()) -> int {
+fn foo(f: &mut FnMut() -> int) -> int {
     f()
 }
 
 fn main() {
-    let z = foo(|| 22);
+    let z = foo(&mut || 22);
     assert_eq!(z, 22);
 }