This reverts commit 10cad2c4.

Petr reports that with this commit in place, io_uring fails the chroot
test (CVE-202-29373). We do need to retain ->fs for send/recvmsg, so
revert this commit.
Reported-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>