fix for ctags

sql/sql_class.h

@@ -6054,6 +6054,7 @@ class multi_update :public select_result_interceptor
   void prepare_to_read_rows();
 };
 
+class my_var_sp;
 class my_var : public Sql_alloc  {
 public:
   const LEX_CSTRING name;
@@ -6062,7 +6063,7 @@ class my_var : public Sql_alloc  {
   my_var(const LEX_CSTRING *j, enum type s) : name(*j), scope(s) { }
   virtual ~my_var() {}
   virtual bool set(THD *thd, Item *val) = 0;
-  virtual class my_var_sp *get_my_var_sp() { return NULL; }
+  virtual my_var_sp *get_my_var_sp() { return NULL; }
 };
 
 class my_var_sp: public my_var {