Fix broken blend intrinsic.

Change-Id: I3a1749aed701e17b48c267ca749c9cf29ca12e43
diff --git a/rs/java/android/renderscript/ScriptIntrinsicBlend.java b/rs/java/android/renderscript/ScriptIntrinsicBlend.java
index d4038c2..906e0f6 100644
--- a/rs/java/android/renderscript/ScriptIntrinsicBlend.java
+++ b/rs/java/android/renderscript/ScriptIntrinsicBlend.java
@@ -99,7 +99,7 @@
      * @param opt LaunchOptions for clipping
      */
     public void forEachSrc(Allocation ain, Allocation aout, Script.LaunchOptions opt) {
-        forEachDst(ain, aout, null);
+        blend(1, ain, aout, null);
     }
 
     /**