allow conic chop to fail

src/gpu/batches/GrAAHairLinePathRenderer.cpp

Index: src/gpu/batches/GrAAHairLinePathRenderer.cpp
diff --git a/src/gpu/batches/GrAAHairLinePathRenderer.cpp b/src/gpu/batches/GrAAHairLinePathRenderer.cpp
index 194c79e41e0d1ef80d8566defc517ee79c2512b1..9d73cf4f17cda711f6fde7e2ecd3ba82a51454f3 100644
--- a/src/gpu/batches/GrAAHairLinePathRenderer.cpp
+++ b/src/gpu/batches/GrAAHairLinePathRenderer.cpp
@@ -145,7 +145,10 @@ static int split_conic(const SkPoint src[3], SkConic dst[2], const SkScalar weig
         if (dst) {
             SkConic conic;
             conic.set(src, weight);
-            conic.chopAt(t, dst);
+            if (!conic.chopAt(t, dst)) {
+                dst[0].set(src, weight);
+                return 1;
+            }
         }
         return 2;
     }