Remove unnecessary slash

lib.rs

@@ -129,7 +129,7 @@ pub fn cpu_id() -> usize {
 }
 
 pub extern fn userspace_init() {
-    assert_eq!(syscall::chdir(b"initfs:bin/"), Ok(0));
+    assert_eq!(syscall::chdir(b"initfs:bin"), Ok(0));
 
     assert_eq!(syscall::open(b"debug:", 0), Ok(0));
     assert_eq!(syscall::open(b"debug:", 0), Ok(1));