Include qemu/queue.h slightly less

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190812052359.30071-20-armbru@redhat.com>
diff --git a/nbd/client.c b/nbd/client.c
index 4de3063..d554ae3 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -19,6 +19,7 @@
 
 #include "qemu/osdep.h"
 #include "qapi/error.h"
+#include "qemu/queue.h"
 #include "trace.h"
 #include "nbd-internal.h"
 #include "qemu/cutils.h"