Fix some problems reported by clang static analyzer

Source/core/css/CSSGradientValue.cpp

 /*
  * Copyright (C) 2008 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 244 matching lines @@
     // We can't just push this logic down into the platform-specific Gradient code,
     // because we have to know the extent of the gradient, and possible move the end points.
     if (m_repeating && numStops > 1) {
         // If the difference in the positions of the first and last color-stops is 0,
         // the gradient defines a solid-color image with the color of the last color-stop in the rule.
         float gradientRange = stops[numStops - 1].offset - stops[0].offset;
         if (!gradientRange) {
             stops.first().offset = 0;
             stops.first().color = stops.last().color;
             stops.shrink(1);
-            numStops = 1;
         } else {
             float maxExtent = 1;
 
             // Radial gradients may need to extend further than the endpoints, because they have
             // to repeat out to the corners of the box.
             if (isRadialGradientValue()) {
                 if (!computedGradientLength) {
                     FloatSize gradientSize(gradientStart - gradientEnd);
                     gradientLength = gradientSize.diagonalLength();
                 }
@@ skipping 879 matching lines @@
         equalHorizontalAndVerticalSize = compareCSSValuePtr(m_endHorizontalSize, other.m_endHorizontalSize) && compareCSSValuePtr(m_endVerticalSize, other.m_endVerticalSize);
     else {
         equalShape = !other.m_shape;
         equalSizingBehavior = !other.m_sizingBehavior;
         equalHorizontalAndVerticalSize = !other.m_endHorizontalSize && !other.m_endVerticalSize;
     }
     return equalShape && equalSizingBehavior && equalHorizontalAndVerticalSize && m_stops == other.m_stops;
 }
 
 } // namespace WebCore