Avoid unnecessary floating point usage in av7110 DVB driver

drivers/media/dvb/ttpci/av7110.c

@@ -2706,9 +2706,9 @@ static int tuner_set_tv_freq (struct saa7146_dev *dev, u32 freq)
 	buf[1] = div & 0xff;
 	buf[2] = 0x8e;
 
-	if (freq < 16*168.25 ) 
+	if (freq < (u32) (16*168.25) ) 
 		config = 0xa0;
-	else if (freq < 16*447.25) 
+	else if (freq < (u32) (16*447.25)) 
 		config = 0x90;
 	else
 		config = 0x30;