libbpf: Simplify the return expression of bpf_object__init_maps function

There is no need for special treatment of the 'ret == 0' case.
This patch simplifies the return expression.
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210609115651.3392580-1-wanghai38@huawei.com

tools/lib/bpf/libbpf.c

@@ -2465,10 +2465,8 @@ static int bpf_object__init_maps(struct bpf_object *obj,
 	err = err ?: bpf_object__init_global_data_maps(obj);
 	err = err ?: bpf_object__init_kconfig_map(obj);
 	err = err ?: bpf_object__init_struct_ops_maps(obj);
-	if (err)
-		return err;
 
-	return 0;
+	return err;
 }
 
 static bool section_have_execinstr(struct bpf_object *obj, int idx)