nbd: drop unused nbd_receive_negotiate() aio_context argument

aio_context is always NULL, so drop it.

Suggested-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230830224802.493686-2-stefanha@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
diff --git a/qemu-nbd.c b/qemu-nbd.c
index aaccaa3..b47459f 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -295,8 +295,8 @@
         goto out;
     }
 
-    if (nbd_receive_negotiate(NULL, QIO_CHANNEL(sioc),
-                              NULL, NULL, NULL, &info, &local_error) < 0) {
+    if (nbd_receive_negotiate(QIO_CHANNEL(sioc), NULL, NULL, NULL,
+                              &info, &local_error) < 0) {
         if (local_error) {
             error_report_err(local_error);
         }