fix release warning (unused debug variable)



git-svn-id: http://skia.googlecode.com/svn/trunk@8682 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkGeometry.cpp b/src/core/SkGeometry.cpp
index 32b44f9..a96e35b 100644
--- a/src/core/SkGeometry.cpp
+++ b/src/core/SkGeometry.cpp
@@ -1538,7 +1538,7 @@
     }
 
     *pts = fPts[0];
-    SkPoint* endPts = subdivide(*this, pts + 1, pow2);
+    SkDEBUGCODE(SkPoint* endPts =) subdivide(*this, pts + 1, pow2);
     SkASSERT(endPts - pts == (2 * (1 << pow2) + 1));
     return 1 << pow2;
 }