BUG#30366310: USING A FUNCTION TO ASSIGN DEFAULT VALUES TO

              2 OR MORE VARIABLES CRASHES SERVER

[post-push-fix] Fixing the build failure on mysql-5.6

Change-Id: I10c149616686f4a5dadd4794bc166313cea1e29e

Author: wikigurram

sql/sql_yacc.yy

@@ -3124,7 +3124,7 @@ sp_decl:
                                        first_spvar->type, 0, 0);
                 if (item == NULL)
                   MYSQL_YYABORT; // OOM
-#ifndef NDEBUG
+#ifndef DBUG_OFF
                 item->m_sp = lex->sphead;
 #endif
                 dflt_value_item = item;