io_uring: io_sq_thread() doesn't need to flush signals

We're not handling signals by default in kernel threads, and we never
use TWA_SIGNAL for the SQPOLL thread internally. Hence we can never
have a signal pending, and we don't need to check for it (nor flush it).
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -6709,8 +6709,6 @@ static int io_sq_thread(void *data)
 					io_ring_clear_wakeup_flag(ctx);
 					continue;
 				}
-				if (signal_pending(current))
-					flush_signals(current);
 				schedule();
 				finish_wait(&ctx->sqo_wait, &wait);