msgb: add inline msgb_queue_free()

Related: Iaad35f03e3bdfabf3ba82b16e563c0a5d1f03639 (libosmo-netif)
Change-Id: Ia291832ca445d4071f0ed9a01730d945ff691cf7
diff --git a/TODO-RELEASE b/TODO-RELEASE
index fb0bfea..99865c6 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -7,3 +7,4 @@
 # If any interfaces have been added since the last public release: c:r:a + 1.
 # If any interfaces have been removed or changed since the last public release: c:r:0.
 #library	what			description / commit summary line
+core		msgb_queue_free()	add inline func to msgb.h
diff --git a/include/osmocom/core/msgb.h b/include/osmocom/core/msgb.h
index 9c3ccf0..335067e 100644
--- a/include/osmocom/core/msgb.h
+++ b/include/osmocom/core/msgb.h
@@ -72,6 +72,15 @@
 extern struct msgb *msgb_copy(const struct msgb *msg, const char *name);
 static int msgb_test_invariant(const struct msgb *msg) __attribute__((pure));
 
+/*! Free all msgbs from a queue built with msgb_enqueue().
+ * \param[in] queue  list head of a msgb queue.
+ */
+static inline void msgb_queue_free(struct llist_head *queue)
+{
+	struct msgb *msg;
+	while ((msg = msgb_dequeue(queue))) msgb_free(msg);
+}
+
 #ifdef MSGB_DEBUG
 #include <osmocom/core/panic.h>
 #define MSGB_ABORT(msg, fmt, args ...) do {		\