ALSA: maestro: Use DIV_ROUND_CLOSEST() instead of open-coding it

Use DIV_ROUND_CLOSEST() 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>
@r1@
expression x;
constant C1;
constant C2;
@@
 ((x) + C1) / C2

@script:python@
C1 << r1.C1;
C2 << r1.C2;
@@
try:
	if int(C1) * 2 != int(C2):
		cocci.include_match(False)
except:
	cocci.include_match(False)

@@
expression r1.x;
constant r1.C1;
constant r1.C2;
@@
-(((x) + C1) / C2)
+DIV_ROUND_CLOSEST(x, C2)
// </smpl>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20201223172229.781-18-lars@metafoo.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/maestro3.c

@@ -1245,7 +1245,7 @@ static void snd_m3_pcm_setup2(struct snd_m3 *chip, struct m3_dma *s,
 			  snd_pcm_format_width(runtime->format) == 16 ? 0 : 1);
 
 	/* set up dac/adc rate */
-	freq = ((runtime->rate << 15) + 24000 ) / 48000;
+	freq = DIV_ROUND_CLOSEST(runtime->rate << 15, 48000);
 	if (freq) 
 		freq--;