io_uring: initialize fixed_file_data lock

syzbot reports below warning:
INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 1 PID: 7099 Comm: syz-executor897 Not tainted 5.6.0-next-20200406-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 assign_lock_key kernel/locking/lockdep.c:913 [inline]
 register_lock_class+0x1664/0x1760 kernel/locking/lockdep.c:1225
 __lock_acquire+0x104/0x4e00 kernel/locking/lockdep.c:4223
 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4923
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:159
 io_sqe_files_register fs/io_uring.c:6599 [inline]
 __io_uring_register+0x1fe8/0x2f00 fs/io_uring.c:8001
 __do_sys_io_uring_register fs/io_uring.c:8081 [inline]
 __se_sys_io_uring_register fs/io_uring.c:8063 [inline]
 __x64_sys_io_uring_register+0x192/0x560 fs/io_uring.c:8063
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x440289
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffff1bbf558 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440289
RDX: 0000000020000280 RSI: 0000000000000002 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000401b10
R13: 0000000000401ba0 R14: 0000000000000000 R15: 0000000000000000

Initialize struct fixed_file_data's lock to fix this issue.

Reported-by: syzbot+e6eeca4a035da76b3065@syzkaller.appspotmail.com
Fixes: 05589553 ("io_uring: refactor file register/unregister/update handling")
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -6501,6 +6501,7 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
 	ctx->file_data->ctx = ctx;
 	init_completion(&ctx->file_data->done);
 	INIT_LIST_HEAD(&ctx->file_data->ref_list);
+	spin_lock_init(&ctx->file_data->lock);
 
 	nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE);
 	ctx->file_data->table = kcalloc(nr_tables,