Write error message ebfore aborting if not all memory is released

Also don't abort if global_status_var.global_memory_used != 0 on not
normal exit as then it's likely that not all memory is released.

sql/mysqld.cc

@@ -2161,15 +2161,15 @@ static void mysqld_exit(int exit_code)
   shutdown_performance_schema();        // we do it as late as possible
 #endif
   set_malloc_size_cb(NULL);
-  if (!opt_debugging && !my_disable_leak_check)
+  if (opt_endinfo && global_status_var.global_memory_used)
+    fprintf(stderr, "Warning: Memory not freed: %ld\n",
+            (long) global_status_var.global_memory_used);
+  if (!opt_debugging && !my_disable_leak_check && exit_code == 0)
   {
     DBUG_ASSERT(global_status_var.global_memory_used == 0);
   }
   cleanup_tls();
   DBUG_LEAVE;
-  if (opt_endinfo && global_status_var.global_memory_used)
-    fprintf(stderr, "Warning: Memory not freed: %ld\n",
-            (long) global_status_var.global_memory_used);
   sd_notify(0, "STATUS=MariaDB server is down");
   exit(exit_code); /* purecov: inspected */
 }