net/rxrpc/ar-key.c: drop negativity check on unsigned value

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=80611
Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Andrey Utkin <andrey.krieger.utkin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/rxrpc/ar-key.c

@@ -346,7 +346,7 @@ static int rxrpc_krb5_decode_tagged_array(struct krb5_tagged_data **_td,
 
 	n_elem = ntohl(*xdr++);
 	toklen -= 4;
-	if (n_elem < 0 || n_elem > max_n_elem)
+	if (n_elem > max_n_elem)
 		return -EINVAL;
 	*_n_elem = n_elem;
 	if (n_elem > 0) {