NFSD: Cleanup unused variable in nfsd_setuser()

Commit 8f6c5ffc8987 ("kernel/groups.c: remove return value of
set_groups") removed the last use of "ret".

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/auth.c b/fs/nfsd/auth.c
index 1042325..72f4482 100644
--- a/fs/nfsd/auth.c
+++ b/fs/nfsd/auth.c
@@ -24,7 +24,6 @@
 	struct cred *new;
 	int i;
 	int flags = nfsexp_flags(rqstp, exp);
-	int ret;
 
 	validate_process_creds();
 
@@ -85,8 +84,7 @@
 	return 0;
 
 oom:
-	ret = -ENOMEM;
 	abort_creds(new);
-	return ret;
+	return -ENOMEM;
 }