cifs: Fix xid leak in cifs_ses_add_channel()

stable inclusion
from stable-v5.10.152
commit 7286f875510486fdc2fc426b7c826262e2283a65
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I73HJ0

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=7286f875510486fdc2fc426b7c826262e2283a65



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[ Upstream commit e909d054 ]

Before return, should free the xid, otherwise, the
xid will be leaked.

Fixes: d70e9fa5 ("cifs: try opening channels after mounting")
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Lipeng Sang <sanglipeng1@jd.com>