Fix assert

https://codereview.appspot.com/7234050/



git-svn-id: http://skia.googlecode.com/svn/trunk@7428 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkDashPathEffect.cpp b/src/effects/SkDashPathEffect.cpp
index be73160..1283628 100644
--- a/src/effects/SkDashPathEffect.cpp
+++ b/src/effects/SkDashPathEffect.cpp
@@ -148,7 +148,7 @@
                                            intervalLength);
     }
 
-    SkASSERT(maxX > minX);
+    SkASSERT(maxX >= minX);
     if (dx < 0) {
         SkTSwap(minX, maxX);
     }