update event flags after successful io_submit()

src/os/unix/ngx_linux_aio_read.c

diff --git a/src/os/unix/ngx_linux_aio_read.c b/src/os/unix/ngx_linux_aio_read.c
index 834a11d..72875ca 100644
--- a/src/os/unix/ngx_linux_aio_read.c
+++ b/src/os/unix/ngx_linux_aio_read.c
@@ -95,6 +95,10 @@
     n = io_submit(ngx_aio_ctx, 1, piocb);
 
     if (n == 1) {
+        ev->active = 1;
+        ev->ready = 0;
+        ev->complete = 0;
+
         return NGX_AGAIN;
     }