getValue for MComboBoxPeer

struct Hjava_lang_String * 
sun_awt_motif_MComboBoxPeer_getValue(
        struct Hsun_awt_motif_MComboBoxPeer *this)
{
    struct ComponentData *cdata = PDATA(ComponentData, this);
    char *str;

    if (cdata == 0 || cdata->widget == 0) {
        SignalError(0, JAVAPKG "NullPointerException", 0);
        return 0;
    }
    AWT_LOCK();
    str = XmComboBoxValue(cdata->widget);
    AWT_UNLOCK();
    return makeJavaString(str, strlen(str));
}