strv: return NULL from strv_free()

We always return NULL/invalid-object from destructors, fix strv_free() to
do the same.

2 files changed, 3 insertions, 2 deletions

diff --git a/src/shared/strv.c b/src/shared/strv.c
index ee45ad1d0f..8c6ba6a633 100644
--- a/src/shared/strv.c
+++ b/src/shared/strv.c
@@ -80,9 +80,10 @@ void strv_clear(char **l) {
         *l = NULL;
 }
 
-void strv_free(char **l) {
+char **strv_free(char **l) {
         strv_clear(l);
         free(l);
+        return NULL;
 }
 
 char **strv_copy(char * const *l) {
diff --git a/src/shared/strv.h b/src/shared/strv.h
index 518c4c2aa8..a80ccd6427 100644
--- a/src/shared/strv.h
+++ b/src/shared/strv.h
@@ -31,7 +31,7 @@ char *strv_find(char **l, const char *name) _pure_;
 char *strv_find_prefix(char **l, const char *name) _pure_;
 char *strv_find_startswith(char **l, const char *name) _pure_;
 
-void strv_free(char **l);
+char **strv_free(char **l);
 DEFINE_TRIVIAL_CLEANUP_FUNC(char**, strv_free);
 #define _cleanup_strv_free_ _cleanup_(strv_freep)