Fix a bunch of cases where the exception code is checked by the function but is not zeroed first.

        * bindings/js/kjs_binding.cpp:
        (KJS::setDOMException):
        * dom/Attr.cpp:
        (WebCore::Attr::setPrefix):
        * dom/Document.cpp:
        (WebCore::Document::createElement):
        * dom/Element.cpp:
        (WebCore::Element::setPrefix):
        * dom/Range.cpp:
        (WebCore::Range::setStart):
        (WebCore::Range::setEnd):
        (WebCore::Range::isPointInRange):
        (WebCore::Range::comparePoint):
        (WebCore::Range::compareBoundaryPoints):
        (WebCore::Range::deleteContents):
        (WebCore::Range::processContents):
        (WebCore::Range::extractContents):
        (WebCore::Range::insertNode):
        (WebCore::Range::setStartAfter):
        (WebCore::Range::setEndBefore):
        (WebCore::Range::setEndAfter):
        (WebCore::Range::selectNode):
        (WebCore::Range::surroundContents):
        (WebCore::Range::setStartBefore):
        * editing/TextIterator.cpp:
        (WebCore::TextIterator::TextIterator):
        * html/CanvasRenderingContext2D.cpp:
        (WebCore::CanvasRenderingContext2D::createPattern):
        * html/HTMLMediaElement.cpp:
        (WebCore::HTMLMediaElement::play):
        (WebCore::HTMLMediaElement::pause):
        * html/HTMLSelectElement.cpp:
        (WebCore::HTMLSelectElement::add):
        (WebCore::HTMLSelectElement::setOption):
        * xml/XPathEvaluator.cpp:
        (WebCore::XPathEvaluator::evaluate):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@27701 268f45cc-cd09-0410-ab3c-d52691b4dbfc