Fix debug build after r7153 (removed param referenced in assertion)



git-svn-id: http://skia.googlecode.com/svn/trunk@7154 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/gradients/SkLinearGradient.cpp b/src/effects/gradients/SkLinearGradient.cpp
index 1c95f29..8ae7646 100644
--- a/src/effects/gradients/SkLinearGradient.cpp
+++ b/src/effects/gradients/SkLinearGradient.cpp
@@ -547,7 +547,7 @@
 /////////////////////////////////////////////////////////////////////
 
 GrEffect* SkLinearGradient::asNewEffect(GrContext* context, const SkPaint&) const {
-    SkASSERT(NULL != context && NULL != stage);
+    SkASSERT(NULL != context);
     SkMatrix matrix;
     if (!this->getLocalMatrix().invert(&matrix)) {
         return false;