Merge 96151 - Rapidly refreshing a feMorphology[erode] with r=0 can sometimes cause display corru...

Source/WebCore/platform/graphics/filters/FEMorphology.cpp

Index: Source/WebCore/platform/graphics/filters/FEMorphology.cpp
===================================================================
--- Source/WebCore/platform/graphics/filters/FEMorphology.cpp	(revision 96370)
+++ Source/WebCore/platform/graphics/filters/FEMorphology.cpp	(working copy)
@@ -207,8 +207,10 @@
         return;
 
     setIsAlphaImage(in->isAlphaImage());
-    if (m_radiusX <= 0 || m_radiusY <= 0)
+    if (m_radiusX <= 0 || m_radiusY <= 0) {
+        dstPixelArray->clear();
         return;
+    }
 
     Filter* filter = this->filter();
     int radiusX = static_cast<int>(floorf(filter->applyHorizontalScale(m_radiusX)));