NFS fix COMMIT after COPY

Fix a typo in the commit e0926934
"NFS append COMMIT after synchronous COPY"
Reported-by: NEryu Guan <eguan@redhat.com>
Fixes: e0926934 ("NFS append COMMIT after synchronous COPY")
Signed-off-by: NOlga Kornievskaia <kolga@netapp.com>
Tested-by: NEryu Guan <eguan@redhat.com>
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/nfs42proc.c

@@ -177,7 +177,7 @@ static ssize_t _nfs42_proc_copy(struct file *src,
 	if (status)
 		goto out;
 
-	if (!nfs_write_verifier_cmp(&res->write_res.verifier.verifier,
+	if (nfs_write_verifier_cmp(&res->write_res.verifier.verifier,
 				    &res->commit_res.verf->verifier)) {
 		status = -EAGAIN;
 		goto out;