6.0 Condition check issue

The following code, after upgrading from 5 to 6.0 and then 6.01 is throwing a warning on the if (changed) line towards the end. It says that changed is always false but that is not true. The various checks along the way can set changed to true.

 curgroups = gwitem.getGroups();
                if (curgroups != groups) {
                    try {
                        gwitem.setGroups(groups);
                        changed = true;
                    }
                    catch (Exception ee) {
                        // Oooookay, ignore then.
                    }
                }
                if (changed) {
                    roster.updateRosterItem(gwitem);
                }
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