rlimit-util: add a common destructor call for arrays of struct rlimit

src/basic/rlimit-util.c

@@ -324,3 +324,13 @@ int rlimit_from_string_harder(const char *s) {
 
         return rlimit_from_string(s);
 }
+
+void rlimit_free_all(struct rlimit **rl) {
+        int i;
+
+        if (!rl)
+                return;
+
+        for (i = 0; i < _RLIMIT_MAX; i++)
+                rl[i] = mfree(rl[i]);
+}