queue.c: Silence compiler warnings

Signed-off-by: 李通洲 <carter.li@eoitek.com>
diff --git a/src/queue.c b/src/queue.c
index 32d3754..0112876 100644
--- a/src/queue.c
+++ b/src/queue.c
@@ -36,7 +36,7 @@
 	int ret = 0, err;
 
 	do {
-		unsigned flags;
+		unsigned flags = 0;
 
 		err = __io_uring_peek_cqe(ring, cqe_ptr);
 		if (err)