SVGFilterBuilder::getEffectById never return nullptr

third_party/WebKit/Source/core/svg/SVGFEComponentTransferElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 44 matching lines @@
         invalidate();
         return;
     }
 
     SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
 }
 
 PassRefPtrWillBeRawPtr<FilterEffect> SVGFEComponentTransferElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
 {
     FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
-
-    if (!input1)
-        return nullptr;
+    ASSERT(input1);
 
     ComponentTransferFunction red;
     ComponentTransferFunction green;
     ComponentTransferFunction blue;
     ComponentTransferFunction alpha;
 
     for (SVGElement* element = Traversal<SVGElement>::firstChild(*this); element; element = Traversal<SVGElement>::nextSibling(*element)) {
         if (isSVGFEFuncRElement(*element))
             red = toSVGFEFuncRElement(*element).transferFunction();
         else if (isSVGFEFuncGElement(*element))
             green = toSVGFEFuncGElement(*element).transferFunction();
         else if (isSVGFEFuncBElement(*element))
             blue = toSVGFEFuncBElement(*element).transferFunction();
         else if (isSVGFEFuncAElement(*element))
             alpha = toSVGFEFuncAElement(*element).transferFunction();
     }
 
     RefPtrWillBeRawPtr<FilterEffect> effect = FEComponentTransfer::create(filter, red, green, blue, alpha);
     effect->inputEffects().append(input1);
     return effect.release();
 }
 
 }