lp:700982 - Non-portable code in client plugin (fails on ARM).

don't pass NULL as an argument where va_list is expected.

sql-common/client_plugin.c

@@ -239,6 +239,8 @@ int mysql_client_plugin_init()
 {
   MYSQL mysql;
   struct st_mysql_client_plugin **builtin;
+  va_list unused;
+  LINT_INIT_STRUCT(unused);
 
   if (initialized)
     return 0;
@@ -255,7 +257,7 @@ int mysql_client_plugin_init()
   pthread_mutex_lock(&LOCK_load_client_plugin);
 
   for (builtin= mysql_client_builtins; *builtin; builtin++)
-    add_plugin(&mysql, *builtin, 0, 0, 0);
+    add_plugin(&mysql, *builtin, 0, 0, unused);
 
   pthread_mutex_unlock(&LOCK_load_client_plugin);
 
@@ -301,6 +303,9 @@ struct st_mysql_client_plugin *
 mysql_client_register_plugin(MYSQL *mysql,
                              struct st_mysql_client_plugin *plugin)
 {
+  va_list unused;
+  LINT_INIT_STRUCT(unused);
+
   if (is_not_initialized(mysql, plugin->name))
     return NULL;
 
@@ -315,7 +320,7 @@ mysql_client_register_plugin(MYSQL *mysql,
     plugin= NULL;
   }
   else
-    plugin= add_plugin(mysql, plugin, 0, 0, 0);
+    plugin= add_plugin(mysql, plugin, 0, 0, unused);
 
   pthread_mutex_unlock(&LOCK_load_client_plugin);
   return plugin;