Do not call blitV with 0 height

src/core/SkScan_AAAPath.cpp

 /*
  * Copyright 2016 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.
  */
 
 #include "SkAntiRun.h"
 #include "SkBlitter.h"
 #include "SkEdge.h"
@@ skipping 1007 matching lines @@
                     }
                 }
             } else { // left and rite are within the same pixel
                 if (partialTop > 0) {
                     blitter->getRealBlitter()->blitV(fullLeft - 1, fullTop - 1, 1,
                             f2a(SkFixedMul_lowprec(partialTop, rite - left)));
                     if (forceRLE) {
                         ((RunBasedAdditiveBlitter*)blitter)->flush_if_y_changed(y, y + partialTop);
                     }
                 }
-                if (fullBot >= fullTop) {
+                if (fullBot > fullTop) {
                     blitter->getRealBlitter()->blitV(fullLeft - 1, fullTop, fullBot - fullTop,
                             f2a(rite - left));
                 }
                 if (partialBot > 0) {
                     blitter->getRealBlitter()->blitV(fullLeft - 1, fullBot, 1,
                             f2a(SkFixedMul_lowprec(partialBot, rite - left)));
                 }
             }
 
             y = local_bot_fixed;
@@ skipping 305 matching lines @@
         AAAFillPath(path, clip.bwRgn(), blitter);
     } else {
         SkRegion        tmp;
         SkAAClipBlitter aaBlitter;
 
         tmp.setRect(clip.getBounds());
         aaBlitter.init(blitter, &clip.aaRgn());
         AAAFillPath(path, tmp, &aaBlitter, true);
     }
 }