Correct a small mistake in SkPath::build_arc_conics

src/core/SkPath.cpp

Index: src/core/SkPath.cpp
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index 4c49e6bc126e6871cf102dc64b75120173951368..752be8b064a9998bc7f6a3c6f665ed40c11bfc3e 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -1089,7 +1089,7 @@ static int build_arc_conics(const SkRect& oval, const SkVector& start, const SkV
 
     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;
 }