Replace NULL macros with nullptr literals.

Change-Id: I918c40879aa547438f77e7d1a95fa2aa33bec398
diff --git a/tests/cppbasic-shared/Android.mk b/tests/cppbasic-shared/Android.mk
index 63cd715..34826a0 100644
--- a/tests/cppbasic-shared/Android.mk
+++ b/tests/cppbasic-shared/Android.mk
@@ -15,6 +15,8 @@
 
 intermediates := $(call intermediates-dir-for,STATIC_LIBRARIES,libRS,TARGET,)
 
+LOCAL_CFLAGS := -std=c++11
+
 LOCAL_C_INCLUDES += external/stlport/stlport bionic/ bionic/libstdc++/include
 LOCAL_C_INCLUDES += frameworks/rs/cpp
 LOCAL_C_INCLUDES += frameworks/rs
diff --git a/tests/cppbasic-shared/compute.cpp b/tests/cppbasic-shared/compute.cpp
index d93b453..6741d7a 100644
--- a/tests/cppbasic-shared/compute.cpp
+++ b/tests/cppbasic-shared/compute.cpp
@@ -42,7 +42,7 @@
         sc->set_elem(e);
         sc->set_type(t);
         sc->set_script(sc);
-        sc->set_script(NULL);
+        sc->set_script(nullptr);
         sp<const Sampler> samp = Sampler::CLAMP_NEAREST(rs);
         sc->set_sampler(samp);