fix the memory leak

src/mme/mme_context.c

@@ -1602,6 +1602,12 @@ status_t mme_enb_remove_all()
     for (hi = mme_enb_first(); hi; hi = mme_enb_next(hi))
     {
         enb = mme_enb_this(hi);
+#ifdef NO_FD_LOCK
+        if (enb->sock_type == SOCK_STREAM)
+            s1ap_delete(enb->sock);
+#else
+#error do not use lock in socket fd
+#endif
         mme_enb_remove(enb);
     }