[PATCH bpf-next] libbf: fix uninitialized pointer at btf__parse_raw()

[Daniel T. Lee]

Recently, from commit 94a1fedd63ed ("libbpf: Add btf__parse_raw() and
generic btf__parse() APIs"), new API has been added to libbpf that
allows to parse BTF from raw data file (btf__parse_raw()).

The commit derives build failure of samples/bpf due to improper access
of uninitialized pointer at btf_parse_raw().

    btf.c: In function btf__parse_raw:
    btf.c:625:28: error: btf may be used uninitialized in this function
      625 |  return err ? ERR_PTR(err) : btf;
          |         ~~~~~~~~~~~~~~~~~~~^~~~~

This commit fixes the build failure of samples/bpf by adding code of
initializing btf pointer as NULL.

Fixes: 94a1fedd63ed ("libbpf: Add btf__parse_raw() and generic btf__parse() 
APIs")
Signed-off-by: Daniel T. Lee <danieltim...@gmail.com>
---
 tools/lib/bpf/btf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 856b09a04563..4843e44916f7 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -564,8 +564,8 @@ struct btf *btf__parse_elf(const char *path, struct btf_ext 
**btf_ext)
 
 struct btf *btf__parse_raw(const char *path)
 {
+       struct btf *btf = NULL;
        void *data = NULL;
-       struct btf *btf;
        FILE *f = NULL;
        __u16 magic;
        int err = 0;
-- 
2.25.1