code: public @CheckForNull Computer toComputer() {
          Jenkins j = Jenkins.getInstanceOrNull();
          if (j != null) {
              for (Computer c : j.getComputers()) {
                  if (getChannel()==c.getChannel()) {
                      return c;
                  }
              }
          }
          return null;
      }
docs: If this {@link FilePath} represents a file on a particular {@link Computer}, return it.
  Otherwise null.
  @since 1.571