V4L/DVB (9447): stb6100: improve rounding

Optimization: Round the requested value to achieve a
+/-1MHz error instead of +0/-2MHz
Signed-off-by: Reinhard Nissl <rnissl@gmx.de>
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/stb6100.c

@@ -276,7 +276,7 @@ static int stb6100_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
 	else if (bandwidth <= 5000000)	/* bw/2 min = 5Mhz for F=0			*/
 		tmp = 0;
 	else				/* if 5 < bw/2 < 36				*/
-		tmp = bandwidth / 1000000 - 5;
+		tmp = (bandwidth + 500000) / 1000000 - 5;
 
 	/* Turn on LPF bandwidth setting clock control,
 	 * set bandwidth, wait 10ms, turn off.