qemu/queue.h: simplify reverse access to QTAILQ

The new definition of QTAILQ does not require passing the headname,
remove it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/net/filter.c b/net/filter.c
index c9f9e5f..28d1930 100644
--- a/net/filter.c
+++ b/net/filter.c
@@ -55,7 +55,7 @@
         next = QTAILQ_NEXT(nf, next);
     } else {
         /* reverse order */
-        next = QTAILQ_PREV(nf, NetFilterHead, next);
+        next = QTAILQ_PREV(nf, next);
     }
 
     return next;