Convert to int from DOMString that check for null implementation and return 0 in case.

BUG: 338059
FIXED-IN: 4.14.4

khtml/html/html_formimpl.cpp

@@ -2447,11 +2447,11 @@ void HTMLSelectElementImpl::parseAttribute(AttributeImpl *attr)
     switch(attr->id())
     {
     case ATTR_SIZE:
-        m_size = qMax( attr->val()->toInt(), 1 );
+        m_size = qMax(attr->value().toInt(), 1);
         setChanged();
         break;
     case ATTR_WIDTH:
-        m_minwidth = qMax( attr->val()->toInt(), 0 );
+        m_minwidth = qMax(attr->value().toInt(), 0);
         break;
     case ATTR_MULTIPLE:
         m_multiple = (attr->val() != 0);