Use proper SkFDot6 instead of int

src/core/SkEdge.h

Index: src/core/SkEdge.h
diff --git a/src/core/SkEdge.h b/src/core/SkEdge.h
index 67a0ee78760476948a33ae757019d423ef4cc4b8..09c021c91829357d28e0945c6aa515d6acb129d2 100644
--- a/src/core/SkEdge.h
+++ b/src/core/SkEdge.h
@@ -120,7 +120,7 @@ int SkEdge::setLine(const SkPoint& p0, const SkPoint& p1, int shift) {
     }
 
     SkFixed slope = SkFDot6Div(x1 - x0, y1 - y0);
-    const int dy  = SkEdge_Compute_DY(top, y0);
+    const SkFDot6 dy  = SkEdge_Compute_DY(top, y0);
 
     fX          = SkFDot6ToFixed(x0 + SkFixedMul(slope, dy));   // + SK_Fixed1/2
     fDX         = slope;