io_uring: simplify io_run_task_work_sig return

Nobody cares about io_run_task_work_sig returning 1, we only check for
negative errors. Simplify by keeping to 0/-error returns.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/3aec8a532c003d6e50739b969a82989402696170.1691757663.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -2477,10 +2477,10 @@ int io_run_task_work_sig(struct io_ring_ctx *ctx)
 	if (!llist_empty(&ctx->work_llist)) {
 		__set_current_state(TASK_RUNNING);
 		if (io_run_local_work(ctx) > 0)
-			return 1;
+			return 0;
 	}
 	if (io_run_task_work() > 0)
-		return 1;
+		return 0;
 	if (task_sigpending(current))
 		return -EINTR;
 	return 0;