If stardup the symlink target failed, should free the xid,
otherwise the xid will be leaked.

Fixes: 76894f3e ("cifs: improve symlink handling for smb2+")
Reviewed-by: NPaulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: NZhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: NSteve French <stfrench@microsoft.com>