ioq: Copy ring_ops from the previous thread

Otherwise threads 2-N won't use io_uring at all!  Oops.

Fixes: 8bc72d6 ("ioq: Probe for supported io_uring operations")

Author: tavianator

src/ioq.c

@@ -850,6 +850,7 @@ static int ioq_ring_init(struct ioq *ioq, struct ioq_thread *thread) {
 
 	if (prev) {
 		// Initial setup already complete
+		thread->ring_ops = prev->ring_ops;
 		return 0;
 	}
 
@@ -916,12 +917,14 @@ static void ioq_thread_join(struct ioq_thread *thread) {
 }
 
 struct ioq *ioq_create(size_t depth, size_t nthreads) {
-	struct ioq *ioq = ZALLOC_FLEX(struct ioq, threads, nthreads);
+	struct ioq *ioq = ALLOC_FLEX(struct ioq, threads, nthreads);
 	if (!ioq) {
 		goto fail;
 	}
 
 	ioq->depth = depth;
+	ioq->size = 0;
+	ioq->cancel = false;
 
 	ARENA_INIT(&ioq->ents, struct ioq_ent);