cifs: Fix lost destroy smbd connection when MR allocate failed

In the Linux kernel, the following vulnerability has been resolved:

cifs: Fix lost destroy smbd connection when MR allocate failed

If the MR allocate failed, the smb direct connection info is NULL,

then smbd_destroy() will directly return, then the connection info

will be leaked.

Let's set the smb direct connection info to the server before call

smbd_destroy().