fix pathops fuzz failures

src/pathops/SkDLineIntersection.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkIntersections.h"
 #include "SkPathOpsLine.h"
 
 void SkIntersections::cleanUpParallelLines(bool parallel) {
     while (fUsed > 2) {
         removeOne(1);
     }
     if (fUsed == 2 && !parallel) {
-        bool startMatch = fT[0][0] == 0 || fT[1][0] == 0 || fT[1][0] == 1;
-        bool endMatch = fT[0][1] == 1 || fT[1][1] == 0 || fT[1][1] == 1;
+        bool startMatch = fT[0][0] == 0 || zero_or_one(fT[1][0]);
+        bool endMatch = fT[0][1] == 1 || zero_or_one(fT[1][1]);
         if ((!startMatch && !endMatch) || approximately_equal(fT[0][0], fT[0][1])) {
             SkASSERT(startMatch || endMatch);
-            removeOne(endMatch);
+            if (startMatch && endMatch && (fT[0][0] != 0 || !zero_or_one(fT[1][0]))
+                    && fT[0][1] == 1 && zero_or_one(fT[1][1])) {
+                removeOne(0);
+            } else {
+                removeOne(endMatch);
+            }
         }
     }
     if (fUsed == 2) {
         fIsCoincident[0] = fIsCoincident[1] = 0x03;
     }
 }
 
 void SkIntersections::computePoints(const SkDLine& line, int used) {
     fPt[0] = line.ptAtT(fT[0][0]);
     if ((fUsed = used) == 2) {
@@ skipping 289 matching lines @@
                     insert((double) index, flipped ? 1 - t : t, line[index]);
                 }
             }
         }
     }
     cleanUpParallelLines(result == 2);
     SkASSERT(fUsed <= 2);
     return fUsed;
 }