fix io_uring setup error reporting

io_uring.c

@@ -10,7 +10,7 @@ struct io_uring ring;
 void init(__attribute__((unused)) int fd) {
 	int res = io_uring_queue_init(1, &ring, 0);
 	if (res < 0) {
-		errno = res;
+		errno = -res;
 		err(EXIT_FAILURE, "io_uring_setup failed");
 	}
 }

io_uring.h

@@ -26,7 +26,7 @@ struct io_uring_sqe* sqpoll_ring_get_sqe(struct io_uring* ring) {
 void io_uring_init_sqpoll(struct io_uring* ring) {
 	int res = io_uring_queue_init(SQPOLL_RING_ENTRIES, ring, IORING_SETUP_SQPOLL);
 	if (res < 0) {
-		errno = res;
+		errno = -res;
 		err(EXIT_FAILURE, "io_uring_setup failed");
 	}
 }