Bug in file NokogiriHelpers.java?

[AppChecker]

Hi!

Please, look the code of function nodesAreEqual (NokogiriHelpers.java, line 551):

   return (((a == null) && (a == null)) ||
                (a != null) && (b != null) &&
                (b.equals(a)));

(a == null) is checked twice.
May be it should be:

   return (((a == null) && (b == null)) ||
                (a != null) && (b != null) &&
                (b.equals(a)));

This possible defect found by AppChecker