libbpf: Wrap libbpf API direct err with libbpf_err

Just wrap the direct err with libbpf_err, keep consistency
with other APIs.

Signed-off-by: Tao Chen <chen.dylane@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20250219153711.29651-1-chen.dylane@linux.dev
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>

src/libbpf.c

@@ -9145,12 +9145,12 @@ int bpf_object__gen_loader(struct bpf_object *obj, struct gen_loader_opts *opts)
 	struct bpf_gen *gen;
 
 	if (!opts)
-		return -EFAULT;
+		return libbpf_err(-EFAULT);
 	if (!OPTS_VALID(opts, gen_loader_opts))
-		return -EINVAL;
+		return libbpf_err(-EINVAL);
 	gen = calloc(sizeof(*gen), 1);
 	if (!gen)
-		return -ENOMEM;
+		return libbpf_err(-ENOMEM);
 	gen->opts = opts;
 	gen->swapped_endian = !is_native_endianness(obj);
 	obj->gen_loader = gen;
@@ -9262,13 +9262,13 @@ int bpf_program__set_insns(struct bpf_program *prog,
 	struct bpf_insn *insns;
 
 	if (prog->obj->loaded)
-		return -EBUSY;
+		return libbpf_err(-EBUSY);
 
 	insns = libbpf_reallocarray(prog->insns, new_insn_cnt, sizeof(*insns));
 	/* NULL is a valid return from reallocarray if the new count is zero */
 	if (!insns && new_insn_cnt) {
 		pr_warn("prog '%s': failed to realloc prog code\n", prog->name);
-		return -ENOMEM;
+		return libbpf_err(-ENOMEM);
 	}
 	memcpy(insns, new_insns, new_insn_cnt * sizeof(*insns));
 
@@ -9379,11 +9379,11 @@ const char *bpf_program__log_buf(const struct bpf_program *prog, size_t *log_siz
 int bpf_program__set_log_buf(struct bpf_program *prog, char *log_buf, size_t log_size)
 {
 	if (log_size && !log_buf)
-		return -EINVAL;
+		return libbpf_err(-EINVAL);
 	if (prog->log_size > UINT_MAX)
-		return -EINVAL;
+		return libbpf_err(-EINVAL);
 	if (prog->obj->loaded)
-		return -EBUSY;
+		return libbpf_err(-EBUSY);
 
 	prog->log_buf = log_buf;
 	prog->log_size = log_size;
@@ -10307,7 +10307,7 @@ int bpf_map__set_value_size(struct bpf_map *map, __u32 size)
 		int err;
 
 		if (map->def.type != BPF_MAP_TYPE_ARRAY)
-			return -EOPNOTSUPP;
+			return libbpf_err(-EOPNOTSUPP);
 
 		mmap_old_sz = bpf_map_mmap_sz(map);
 		mmap_new_sz = array_map_mmap_sz(size, map->def.max_entries);
@@ -10315,7 +10315,7 @@ int bpf_map__set_value_size(struct bpf_map *map, __u32 size)
 		if (err) {
 			pr_warn("map '%s': failed to resize memory-mapped region: %s\n",
 				bpf_map__name(map), errstr(err));
-			return err;
+			return libbpf_err(err);
 		}
 		err = map_btf_datasec_resize(map, size);
 		if (err && err != -ENOENT) {
@@ -13070,17 +13070,17 @@ int bpf_link__update_map(struct bpf_link *link, const struct bpf_map *map)
 	int err;
 
 	if (!bpf_map__is_struct_ops(map))
-		return -EINVAL;
+		return libbpf_err(-EINVAL);
 
 	if (map->fd < 0) {
 		pr_warn("map '%s': can't use BPF map without FD (was it created?)\n", map->name);
-		return -EINVAL;
+		return libbpf_err(-EINVAL);
 	}
 
 	st_ops_link = container_of(link, struct bpf_link_struct_ops, link);
 	/* Ensure the type of a link is correct */
 	if (st_ops_link->map_fd < 0)
-		return -EINVAL;
+		return libbpf_err(-EINVAL);
 
 	err = bpf_map_update_elem(map->fd, &zero, map->st_ops->kern_vdata, 0);
 	/* It can be EBUSY if the map has been used to create or