ALSA: cx46xx: Use DIV_ROUND_UP() instead of open-coding it

Use DIV_ROUND_UP() instead of open-coding it. This documents intent
and makes it more clear what is going on for the casual reviewer.

Generated using the following the Coccinelle semantic patch.

// <smpl>
@@
expression x, y;
@@
-(((x) + (y) - 1) / (y))
+DIV_ROUND_UP(x, y)
// </smpl>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20201223172229.781-5-lars@metafoo.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/cs46xx/cs46xx_lib.c

@@ -813,7 +813,7 @@ static void snd_cs46xx_set_capture_sample_rate(struct snd_cs46xx *chip, unsigned
 	correctionPerGOF = tmp1 / GOF_PER_SEC;
 	tmp1 -= correctionPerGOF * GOF_PER_SEC;
 	correctionPerSec = tmp1;
-	initialDelay = ((48000 * 24) + rate - 1) / rate;
+	initialDelay = DIV_ROUND_UP(48000 * 24, rate);
 
 	/*
 	 *  Fill in the VariDecimate control block.