[DCCP] ccid3: return value in ccid3_hc_rx_calc_first_li

In a recent patch we introduced invalid return codes which will result in the
opposite of what is intended (i.e. send more packets in face of peculiar
network conditions).

This fixes it by returning ~0 which means not calculated as per
dccp_li_hist_calc_i_mean.
Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

net/dccp/ccids/ccid3.c

@@ -845,8 +845,8 @@ static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
 	 * Find some p such that f(p) = fval; return 1/p [RFC 3448, 6.3.1].
 	 */
 	if (rtt == 0) {			/* would result in divide-by-zero */
-		DCCP_WARN("RTT==0, returning 1/p = 1\n");
-		return 1000000;
+		DCCP_WARN("RTT==0\n");
+		return ~0;
 	}
 
 	dccp_timestamp(sk, &tstamp);
@@ -858,7 +858,7 @@ static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
 		DCCP_WARN("X_recv==0\n");
 		if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) {
 			DCCP_BUG("stored value of X_recv is zero");
-			return 1000000;
+			return ~0;
 		}
 	}