message: Fix a flimsy test on macOS @ 1.8
diff: @@ -385,23 +385,17 @@ pub mod tests {
  let _e = silence_errors();
  fn f1() -> Result<herr_t> {
  - let plist_id = h5try!(H5Pcreate(*H5P_ROOT));
  - h5try!(H5Pclose(plist_id));
  + h5try!(H5Pcreate(*H5P_ROOT));
  Ok(100)
  }
  - let result1 = f1();
  - assert!(result1.is_ok());
  - assert_eq!(result1.ok().unwrap(), 100);
  + assert_eq!(f1().unwrap(), 100);
  fn f2() -> Result<herr_t> {
  - let plist_id = h5try!(H5Pcreate(*H5P_ROOT));
  - h5try!(H5Pclose(plist_id));
  - h5try!(H5Pclose(plist_id));
  + h5try!(H5Pcreate(123456));
  Ok(100)
  }
  - let result2 = f2();
  - assert!(result2.is_err());
  + assert!(f2().is_err());
  }
  }
  