NFS: make struct nlmclnt_fl_close_lock_ops static

The structure nlmclnt_fl_close_lock_ops s local to the source and does
not need to be in global scope, so make it static.

Cleans up sparse warning:
fs/nfs/nfs3proc.c:876:33: warning: symbol 'nlmclnt_fl_close_lock_ops' was not
declared. Should it be static?
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/nfs3proc.c

@@ -873,7 +873,7 @@ static void nfs3_nlm_release_call(void *data)
 	}
 }
 
-const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
+static const struct nlmclnt_operations nlmclnt_fl_close_lock_ops = {
 	.nlmclnt_alloc_call = nfs3_nlm_alloc_call,
 	.nlmclnt_unlock_prepare = nfs3_nlm_unlock_prepare,
 	.nlmclnt_release_call = nfs3_nlm_release_call,