Correct a small mistake in SkPath::build_arc_conics

src/core/SkPath.cpp

 /*
  * 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.
  */
 
 #include <cmath>
 #include "SkBuffer.h"
 #include "SkCubicClipper.h"
@@ skipping 1071 matching lines @@
 static int build_arc_conics(const SkRect& oval, const SkVector& start, const SkVector& stop,
                             SkRotationDirection dir, SkConic conics[SkConic::kMaxConicsForArc],
                             SkPoint* singlePt) {
     SkMatrix    matrix;
 
     matrix.setScale(SkScalarHalf(oval.width()), SkScalarHalf(oval.height()));
     matrix.postTranslate(oval.centerX(), oval.centerY());
 
     int count = SkConic::BuildUnitArc(start, stop, dir, &matrix, conics);
     if (0 == count) {
-        matrix.mapXY(start.x(), start.y(), singlePt);
+        matrix.mapXY(stop.x(), stop.y(), singlePt);
     }
     return count;
 }
 
 void SkPath::addRoundRect(const SkRect& rect, const SkScalar radii[],
                           Direction dir) {
     SkRRect rrect;
     rrect.setRectRadii(rect, (const SkVector*) radii);
     this->addRRect(rrect, dir);
 }
@@ skipping 2292 matching lines @@
         path->arcTo(oval, startAngle, 180.f, false);
         startAngle += 180.f;
         forceMoveTo = false;
         sweepAngle -= 360.f;
     }
     path->arcTo(oval, startAngle, sweepAngle, forceMoveTo);
     if (useCenter) {
         path->close();
     }
 }