Besides the macro itself, this patch also adds a corresponding
Coccinelle rule.

Signed-off-by: Max Reitz <mre...@redhat.com>
---
 include/qapi/qmp/qlist.h         | 3 +++
 scripts/coccinelle/qobject.cocci | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/include/qapi/qmp/qlist.h b/include/qapi/qmp/qlist.h
index c4b5fdad9b..59d209bbae 100644
--- a/include/qapi/qmp/qlist.h
+++ b/include/qapi/qmp/qlist.h
@@ -15,6 +15,7 @@
 
 #include "qapi/qmp/qobject.h"
 #include "qapi/qmp/qnum.h"
+#include "qapi/qmp/qnull.h"
 #include "qemu/queue.h"
 
 typedef struct QListEntry {
@@ -37,6 +38,8 @@ typedef struct QList {
         qlist_append(qlist, qbool_from_bool(value))
 #define qlist_append_str(qlist, value) \
         qlist_append(qlist, qstring_from_str(value))
+#define qlist_append_null(qlist) \
+        qlist_append(qlist, qnull())
 
 #define QLIST_FOREACH_ENTRY(qlist, var)             \
         for ((var) = ((qlist)->head.tqh_first);     \
diff --git a/scripts/coccinelle/qobject.cocci b/scripts/coccinelle/qobject.cocci
index 1120eb1a42..47bcafe9a9 100644
--- a/scripts/coccinelle/qobject.cocci
+++ b/scripts/coccinelle/qobject.cocci
@@ -41,4 +41,7 @@ expression Obj, E;
 |
 - qlist_append(Obj, qstring_from_str(E));
 + qlist_append_str(Obj, E);
+|
+- qlist_append(Obj, qnull());
++ qlist_append_null(Obj);
 )
-- 
2.13.6


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