tomoyo: don't special case PF_IO_WORKER for PF_KTHREAD

Since commit 3bfe6106693b6b4b ("io-wq: fork worker threads from original
task") stopped using PF_KTHREAD flag for the io_uring PF_IO_WORKER threads,
tomoyo_kernel_service() no longer needs to check PF_IO_WORKER flag.

(This is a 5.12+ patch. Please don't send to stable kernels.)

Signed-off-by: Jens Axboe <[e-mail]>
Signed-off-by: Tetsuo Handa <[e-mail]>

security/tomoyo/network.c

···
 static bool tomoyo_kernel_service(void)
 {
 	/* Nothing to do if I am a kernel service. */
-	return (current->flags & (PF_KTHREAD | PF_IO_WORKER)) == PF_KTHREAD;
+	return current->flags & PF_KTHREAD;
 }
 
 /**