io_uring: protect register tracing

Syz reports:

BUG: KCSAN: data-race in __se_sys_io_uring_register / io_sqe_files_register

read-write to 0xffff8881021940b8 of 4 bytes by task 5923 on cpu 1:
 io_sqe_files_register+0x2c4/0x3b0 io_uring/rsrc.c:713
 __io_uring_register io_uring/register.c:403 [inline]
 __do_sys_io_uring_register io_uring/register.c:611 [inline]
 __se_sys_io_uring_register+0x8d0/0x1280 io_uring/register.c:591
 __x64_sys_io_uring_register+0x55/0x70 io_uring/register.c:591
 x64_sys_call+0x202/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:428
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881021940b8 of 4 bytes by task 5924 on cpu 0:
 __do_sys_io_uring_register io_uring/register.c:613 [inline]
 __se_sys_io_uring_register+0xe4a/0x1280 io_uring/register.c:591
 __x64_sys_io_uring_register+0x55/0x70 io_uring/register.c:591
 x64_sys_call+0x202/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:428
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Which should be due to reading the table size after unlock. We don't
care much as it's just to print it in trace, but we might as well do it
under the lock.

Reported-by:  <syzbot+5a486fef3de40e0d8c76@syzkaller.appspotmail.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/8233af2886a37b57f79e444e3db88fcfda1817ac.1731942203.git.asml.silence@gmail.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>