Do no circularly define NULL

Runtimes OpenCL
#1

--- generic/include/clc/clcmacros.h (revision 312402)
+++ generic/include/clc/clcmacros.h (working copy)
@@ -9,7 +9,7 @@
#define CLC_VERSION_1_2 120
#endif

-#define NULL ((void*)NULL)
+#define NULL ((void*)0)

#define __kernel_exec(X, typen) __kernel \
                                 __attribute__((work_group_size_hint(X, 1, 1))) \

#2

--- generic/include/clc/clcmacros.h (revision 312402)
+++ generic/include/clc/clcmacros.h (working copy)
@@ -9,7 +9,7 @@
#define CLC_VERSION_1_2 120
#endif

-#define NULL ((void*)NULL)
+#define NULL ((void*)0)

#define __kernel_exec(X, typen) __kernel \
                                 __attribute__((work_group_size_hint(X, 1, 1))) \

right. LGTM
Reviewed-by: Jan Vesely <jan.vesely@rutgers.edu>

Jan