Fix memory leak in swTableColumn_add() [2].
Fix memory leak in swTableColumn_add() [2].

LinkedDestiny/swoole-src,tutanhamon/swoole-src,tutanhamon/swoole-src,AJSoft/swoole-src,LinkedDestiny/swoole-src,LinkedDestiny/swoole-src,LinkedDestiny/swoole-src,tutanhamon/swoole-src,AJSoft/swoole-src,LinkedDestiny/swoole-src,tutanhamon/swoole-src,LinkedDestiny/swoole-src,swoole/swoole-src,swoole/swoole-src,AJSoft/swoole-src,AJSoft/swoole-src,LinkedDestiny/swoole-src,swoole/swoole-src,swoole/swoole-src,AJSoft/swoole-src,tutanhamon/swoole-src,swoole/swoole-src,swoole/swoole-src,AJSoft/swoole-src,swoole/swoole-src,tutanhamon/swoole-src,tutanhamon/swoole-src,AJSoft/swoole-src