Move DBUG_ENTER to begining of function to avoid build failure with debug on windows

libmysql/libmysql.c

@@ -4681,14 +4681,14 @@ int cli_read_binary_rows(MYSQL_STMT *stmt)
   MYSQL_ROWS *cur, **prev_ptr= &result->data;
   NET        *net;
 
+  DBUG_ENTER("cli_read_binary_rows");
+
   if (!mysql)
   {
     set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
     return 1;
   }
 
-  DBUG_ENTER("cli_read_binary_rows");
-
   net = &mysql->net;
   mysql= mysql->last_used_con;