bpf: Use the IS_FD_ARRAY() macro in map_update_elem()

Make the code more readable.

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

kernel/bpf/syscall.c

@@ -709,10 +709,7 @@ static int map_update_elem(union bpf_attr *attr)
 		err = bpf_percpu_hash_update(map, key, value, attr->flags);
 	} else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
 		err = bpf_percpu_array_update(map, key, value, attr->flags);
-	} else if (map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY ||
-		   map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
-		   map->map_type == BPF_MAP_TYPE_CGROUP_ARRAY ||
-		   map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS) {
+	} else if (IS_FD_ARRAY(map)) {
 		rcu_read_lock();
 		err = bpf_fd_array_map_update_elem(map, f.file, key, value,
 						   attr->flags);