util: when we use path_strv_canonicalize() we must allocate the strv from the heap

src/shared/conf-files.c

@@ -148,12 +148,18 @@ int conf_files_list_strv(char ***strv, const char *suffix, const char *root, con
 }
 
 int conf_files_list(char ***strv, const char *suffix, const char *root, const char *dir, ...) {
-        char **dirs;
+        _cleanup_strv_free_ char **dirs = NULL;
+        va_list ap;
 
         assert(strv);
         assert(suffix);
 
-        dirs = strv_from_stdarg_alloca(dir);
+        va_start(ap, dir);
+        dirs = strv_new_ap(dir, ap);
+        va_end(ap);
+
+        if (!dirs)
+                return -ENOMEM;
 
         return conf_files_list_strv_internal(strv, suffix, root, dirs);
 }