fix misc asserts and checks found by fuzzer

include/effects/SkDashPathEffect.h

Index: include/effects/SkDashPathEffect.h
diff --git a/include/effects/SkDashPathEffect.h b/include/effects/SkDashPathEffect.h
index 3c1407b7257946e0072f8db2f87b8d0a1dbd387a..08b0a4693f7409b853439c61d28405aff832b5b3 100644
--- a/include/effects/SkDashPathEffect.h
+++ b/include/effects/SkDashPathEffect.h
@@ -36,10 +36,7 @@ public:
 
         Note: only affects stroked paths.
     */
-    static SkPathEffect* Create(const SkScalar intervals[], int count, SkScalar phase) {
-        return new SkDashPathEffect(intervals, count, phase);
-    }
-    virtual ~SkDashPathEffect();
+    static SkPathEffect* Create(const SkScalar intervals[], int count, SkScalar phase);
 
     virtual bool filterPath(SkPath* dst, const SkPath& src,
                             SkStrokeRec*, const SkRect*) const override;
@@ -58,6 +55,7 @@ public:
 #endif
 
 protected:
+    virtual ~SkDashPathEffect();
     SkDashPathEffect(const SkScalar intervals[], int count, SkScalar phase);
     void flatten(SkWriteBuffer&) const override;
 
@@ -66,6 +64,7 @@ private:
     int32_t     fCount;
     SkScalar    fPhase;
     // computed from phase
+
     SkScalar    fInitialDashLength;
     int32_t     fInitialDashIndex;
     SkScalar    fIntervalLength;