9p/net: fix memory leak in p9_client_create

BugLink: https://bugs.launchpad.net/bugs/1822271

commit bb06c388 upstream.

If msize is less than 4096, we should close and put trans, destroy
tagpool, not just free client. This patch fixes that.

Link: http://lkml.kernel.org/m/1552464097-142659-1-git-send-email-zhengbin13@huawei.com
Cc: stable@vger.kernel.org
Fixes: 574d356b ("9p/net: put a lower bound on msize")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Juerg Haefliger <juerg.haefliger@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

net/9p/client.c

@@ -1058,7 +1058,7 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
 		p9_debug(P9_DEBUG_ERROR,
 			 "Please specify a msize of at least 4k\n");
 		err = -EINVAL;
-		goto free_client;
+		goto close_trans;
 	}
 
 	err = p9_client_version(clnt);