[PATCH V2] bpf: fix warning about using plain integer as NULL

[Bo YU]

Sparse warning below:

sudo make C=2 CF=-D__CHECK_ENDIAN__ M=net/bpf/
CHECK   net/bpf//test_run.c
net/bpf//test_run.c:19:77: warning: Using plain integer as NULL pointer
./include/linux/bpf-cgroup.h:295:77: warning: Using plain integer as NULL 
pointer

Fixes: 8bad74f9840f ("bpf: extend cgroup bpf core to allow multiple
cgroup storage types")

Acked-by: Yonghong Song <y...@fb.com>
Signed-off-by: Bo YU <tsu.y...@gmail.com>
---
V2: Add fix-up tag from Yonghong
---
 include/linux/bpf-cgroup.h | 2 +-
 net/bpf/test_run.c         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
index 695b2a880d9a..a4c644c1c091 100644
--- a/include/linux/bpf-cgroup.h
+++ b/include/linux/bpf-cgroup.h
@@ -292,7 +292,7 @@ static inline int bpf_cgroup_storage_assign(struct bpf_prog 
*prog,
 static inline void bpf_cgroup_storage_release(struct bpf_prog *prog,
                                              struct bpf_map *map) {}
 static inline struct bpf_cgroup_storage *bpf_cgroup_storage_alloc(
-       struct bpf_prog *prog, enum bpf_cgroup_storage_type stype) { return 0; }
+       struct bpf_prog *prog, enum bpf_cgroup_storage_type stype) { return 
NULL; }
 static inline void bpf_cgroup_storage_free(
        struct bpf_cgroup_storage *storage) {}
 static inline int bpf_percpu_cgroup_storage_copy(struct bpf_map *map, void 
*key,
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index da7051d62727..fab142b796ef 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -16,7 +16,7 @@
 static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
                        u32 *retval, u32 *time)
 {
-       struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { 0 };
+       struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { 
NULL };
        enum bpf_cgroup_storage_type stype;
        u64 time_start, time_spent = 0;
        int ret = 0;
-- 
2.11.0