SVGFilterBuilder::getEffectById never return nullptr

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

 /*
  * Copyright (C) 2006 Oliver Hunt <oliver@nerget.com>
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 83 matching lines @@
         return;
     }
 
     SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
 }
 
 PassRefPtrWillBeRawPtr<FilterEffect> SVGFEDisplacementMapElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
 {
     FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
     FilterEffect* input2 = filterBuilder->getEffectById(AtomicString(m_in2->currentValue()->value()));
-
-    if (!input1 || !input2)
-        return nullptr;
+    ASSERT(input1 && input2);
 
     RefPtrWillBeRawPtr<FilterEffect> effect = FEDisplacementMap::create(filter, m_xChannelSelector->currentValue()->enumValue(), m_yChannelSelector->currentValue()->enumValue(), m_scale->currentValue()->value());
     FilterEffectVector& inputEffects = effect->inputEffects();
     inputEffects.reserveCapacity(2);
     inputEffects.append(input1);
     inputEffects.append(input2);
     return effect.release();
 }
 
 } // namespace blink