Revert "lockd: introduce safe async lock op"

This reverts commit 2267b2e8.

ltp test fcntl17 fails on v5.15.154. This was bisected to commit
2267b2e8 ("lockd: introduce safe async lock op").

Reported-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>