Do not call blitV with 0 height

src/core/SkScan_AAAPath.cpp

Index: src/core/SkScan_AAAPath.cpp
diff --git a/src/core/SkScan_AAAPath.cpp b/src/core/SkScan_AAAPath.cpp
index c352b4dc0d67f4b3cc1f5968128dc99c665ae006..be782b83e899735759b49328e526f008e50553fd 100644
--- a/src/core/SkScan_AAAPath.cpp
+++ b/src/core/SkScan_AAAPath.cpp
@@ -1025,7 +1025,7 @@ static inline void aaa_walk_convex_edges(SkAnalyticEdge* prevHead, AdditiveBlitt
                         ((RunBasedAdditiveBlitter*)blitter)->flush_if_y_changed(y, y + partialTop);
                     }
                 }
-                if (fullBot >= fullTop) {
+                if (fullBot > fullTop) {
                     blitter->getRealBlitter()->blitV(fullLeft - 1, fullTop, fullBot - fullTop,
                             f2a(rite - left));
                 }