ksmbd: fix kernel oops in ksmbd_rpc_ioctl/rap()

mainline inclusion
from mainline-5.15-rc1
commit 690f9697
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I60T7G
CVE: NA

Reference: https://git.kernel.org/torvalds/linux/c/690f96970513



-------------------------------

"ksmbd: remove macros in transport_ipc.c" commit change msg to req in
ksmbd_rpc_ioctl/rap(). This will cause kernel oops when running smbclient
-L test.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Zhong Jinghua <zhongjinghua@huawei.com>