sunrpc: change sp_nrthreads from atomic_t to unsigned int.

[ Upstream commit 60749cbe ]

sp_nrthreads is only ever accessed under the service mutex
  nlmsvc_mutex nfs_callback_mutex nfsd_mutex
so these is no need for it to be an atomic_t.

The fact that all code using it is single-threaded means that we can
simplify svc_pool_victim and remove the temporary elevation of
sp_nrthreads.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Stable-dep-of: aadc3bbe ("NFSD: Limit the number of concurrent async COPY operations")
Signed-off-by: Sasha Levin <sashal@kernel.org>