bpftool: Fix error return value in build_btf_type_table

An appropriate return value should be set on the failed path.

Fixes: 4d374ba ("tools: bpftool: implement "bpftool btf show|list"")
Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Zhen Lei <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

Author: Zhen Lei

tools/bpf/bpftool/btf.c

@@ -693,6 +693,7 @@ build_btf_type_table(struct btf_attach_table *tab, enum bpf_obj_type type,
 		obj_node = calloc(1, sizeof(*obj_node));
 		if (!obj_node) {
 			p_err("failed to allocate memory: %s", strerror(errno));
+			err = -ENOMEM;
 			goto err_free;
 		}