fix minor skp-found bugs

src/pathops/SkDLineIntersection.cpp

Index: src/pathops/SkDLineIntersection.cpp
diff --git a/src/pathops/SkDLineIntersection.cpp b/src/pathops/SkDLineIntersection.cpp
index f1adce21005d82b99db5cd988c2f64528643bf7e..89695395e639633b66aa6f1231093c08dd97fe39 100644
--- a/src/pathops/SkDLineIntersection.cpp
+++ b/src/pathops/SkDLineIntersection.cpp
@@ -292,7 +292,7 @@ int SkIntersections::vertical(const SkDLine& line, double x) {
 
 int SkIntersections::vertical(const SkDLine& line, double top, double bottom,
                               double x, bool flipped) {
-    fMax = 2;
+    fMax = 3;  // cleanup parallel lines will bring this back line
     // see if end points intersect the opposite line
     double t;
     SkDPoint topPt = { x, top };
@@ -344,6 +344,7 @@ int SkIntersections::vertical(const SkDLine& line, double top, double bottom,
         }
     }
     cleanUpParallelLines(result == 2);
+    SkASSERT(fUsed <= 2);
     return fUsed;
 }