nfsd: fix cred leak on every rpc

Since override_creds() took its own reference on new, we need to release
our own reference.

(Note the put_cred on the return value puts the *old* value of
current->creds, not the new passed-in value).

Signed-off-by: J. Bruce Fields <[e-mail]>

fs/nfsd/auth.c

···
 		new->cap_effective = cap_raise_nfsd_set(new->cap_effective,
 							new->cap_permitted);
 	put_cred(override_creds(new));
+	put_cred(new);
 	return 0;
 
 oom: