Remove no-op code in SkAlphaRuns::add

src/core/SkAntiRun.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkAntiRun_DEFINED
@@ skipping 53 matching lines @@
                 edge of the current span round to the same super-sampled x value,
                 I might overflow to 256 with this add, hence the funny subtract (crud).
             */
             unsigned tmp = alpha[x] + startAlpha;
             SkASSERT(tmp <= 256);
             alpha[x] = SkToU8(tmp - (tmp >> 8));    // was (tmp >> 7), but that seems wrong if we're trying to catch 256
 
             runs += x + 1;
             alpha += x + 1;
             x = 0;
-            lastAlpha += x; // we don't want the +1
             SkDEBUGCODE(this->validate();)
         }
 
         if (middleCount) {
             SkAlphaRuns::Break(runs, alpha, x, middleCount);
             alpha += x;
             runs += x;
             x = 0;
             do {
                 alpha[0] = SkToU8(alpha[0] + maxValue);
@@ skipping 98 matching lines @@
             x -= n;
         }
     }
 
 private:
     SkDEBUGCODE(int fWidth;)
     SkDEBUGCODE(void validate() const;)
 };
 
 #endif