message: fix typos in vfs tests
diff: @@ -137,7 +137,7 @@ mod open_test {
  // ASSERT:
  assert!(
  vfs_result.is_ok(),
  - "Failed to create file system from empty archive"
  + "Failed to create file system from archive"
  );
  let mut vfs = vfs_result.unwrap();
  // open the file, get a file descriptor
  @@ -173,7 +173,7 @@ mod open_test {
  // ASSERT:
  assert!(
  vfs_result.is_ok(),
  - "Failed to create file system from empty archive"
  + "Failed to create file system from archive"
  );
  let mut vfs = vfs_result.unwrap();
  // read the file
  @@ -224,7 +224,7 @@ mod read_test {
  // ASSERT:
  assert!(
  vfs_result.is_ok(),
  - "Failed to create file system from empty archive"
  + "Failed to create file system from archive"
  );
  let mut vfs = vfs_result.unwrap();
  // read the file
  @@ -256,7 +256,7 @@ mod read_test {
  // ASSERT:
  assert!(
  vfs_result.is_ok(),
  - "Failed to create file system from empty archive"
  + "Failed to create file system from archive"
  );
  let mut vfs = vfs_result.unwrap();
  // read the file
  