resolved: fix crash when shutting down

Reported by Cristian Rodríguez

http://lists.freedesktop.org/archives/systemd-devel/2015-May/031626.html

2 files changed, 5 insertions, 3 deletions

diff --git a/src/shared/prioq.c b/src/shared/prioq.c
index 8af4c51c2f..b89888be0e 100644
--- a/src/shared/prioq.c
+++ b/src/shared/prioq.c
@@ -45,12 +45,14 @@ Prioq *prioq_new(compare_func_t compare_func) {
         return q;
 }
 
-void prioq_free(Prioq *q) {
+Prioq* prioq_free(Prioq *q) {
         if (!q)
-                return;
+                return NULL;
 
         free(q->items);
         free(q);
+
+        return NULL;
 }
 
 int prioq_ensure_allocated(Prioq **q, compare_func_t compare_func) {
diff --git a/src/shared/prioq.h b/src/shared/prioq.h
index d836b36cd9..1c044b135c 100644
--- a/src/shared/prioq.h
+++ b/src/shared/prioq.h
@@ -28,7 +28,7 @@ typedef struct Prioq Prioq;
 #define PRIOQ_IDX_NULL ((unsigned) -1)
 
 Prioq *prioq_new(compare_func_t compare);
-void prioq_free(Prioq *q);
+Prioq *prioq_free(Prioq *q);
 int prioq_ensure_allocated(Prioq **q, compare_func_t compare_func);
 
 int prioq_put(Prioq *q, void *data, unsigned *idx);