Revert "xprtrdma: Fix regbuf data not freed in rpcrdma_req_create()"

This reverts commit bcebcb11 which is
commit 9181f40fb2952fd59ecb75e7158620c9c669eee3 upstream.

The backport to 5.4.y causes problems, as reported by Harshit, so revert
it for now and wait for a working backport to be added.

Reported-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Link: https://lore.kernel.org/r/4d2928e1-c836-b817-3dc2-3fe9adcaf2d6@oracle.com


Cc: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>