can: dev: remove unused variable from can_calc_bittiming() function

this patch removes best_rate variable from can_calc_bittiming()
function which was set but was never used.
Signed-off-by: NLad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/dev.c

@@ -103,11 +103,11 @@ static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt,
 			      const struct can_bittiming_const *btc)
 {
 	struct can_priv *priv = netdev_priv(dev);
-	long rate, best_rate = 0;
 	long best_error = 1000000000, error = 0;
 	int best_tseg = 0, best_brp = 0, brp = 0;
 	int tsegall, tseg = 0, tseg1 = 0, tseg2 = 0;
 	int spt_error = 1000, spt = 0, sampl_pt;
+	long rate;
 	u64 v64;
 
 	/* Use CIA recommended sample points */
@@ -152,7 +152,6 @@ static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt,
 		}
 		best_tseg = tseg / 2;
 		best_brp = brp;
-		best_rate = rate;
 		if (error == 0)
 			break;
 	}