Fix two minor RS bugs.

1: index set size was populated with bad value in java,
2: bad error check in uploadToBufferObject.

Change-Id: I5946053cdfba0b2fbbaa34d562a9ec53e26ce9f2

graphics/java/android/renderscript/Mesh.java

@@ -69,7 +69,7 @@ public class Mesh extends BaseObj {
         int[] primitives = new int[idxCount];
 
         mRS.nMeshGetVertices(mID, vtxIDs, vtxCount);
-        mRS.nMeshGetIndices(mID, idxIDs, primitives, vtxCount);
+        mRS.nMeshGetIndices(mID, idxIDs, primitives, idxCount);
 
         mVertexBuffers = new Allocation[vtxCount];
         mIndexBuffers = new Allocation[idxCount];