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libbpf: Fix handling of optional field_name in btf_dump__emit_type_decl 

Internal functions, used by btf_dump__emit_type_decl(), assume field_name is
never going to be NULL. Ensure it's always the case.

Fixes: 9f81654eeb ("libbpf: Expose BTF-to-C type declaration emitting API")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200303180800.3303471-1-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-03-03 10:08:00 -08:00 committed by Alexei Starovoitov
parent 5fc40f3739
commit 320a36063e
1 changed files with 1 additions and 1 deletions
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tools/lib/bpf/btf_dump.c
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@ -1030,7 +1030,7 @@ int btf_dump__emit_type_decl(struct btf_dump *d, __u32 id,
if (!OPTS_VALID(opts, btf_dump_emit_type_decl_opts))
return -EINVAL;
fname = OPTS_GET(opts, field_name, NULL);
fname = OPTS_GET(opts, field_name, "");
lvl = OPTS_GET(opts, indent_level, 0);
btf_dump_emit_type_decl(d, id, fname, lvl);
return 0;