ALSA: trident: 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>
@@
expression x, y;
@@
-((x) + ((y) / 2)) / (y)
+DIV_ROUND_CLOSEST(x, y)

@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/20201223172229.781-15-lars@metafoo.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/trident/trident_main.c

@@ -678,7 +678,7 @@ static unsigned int snd_trident_convert_rate(unsigned int rate)
 	else if (rate == 48000)
 		delta = 0x1000;
 	else
-		delta = (((rate << 12) + 24000) / 48000) & 0x0000ffff;
+		delta = DIV_ROUND_CLOSEST(rate << 12, 48000) & 0x0000ffff;
 	return delta;
 }
 
@@ -1034,7 +1034,7 @@ static int snd_trident_capture_prepare(struct snd_pcm_substream *substream)
 	ESO_bytes++;
 
 	// Set channel sample rate, 4.12 format
-	val = (((unsigned int) 48000L << 12) + (runtime->rate/2)) / runtime->rate;
+	val = DIV_ROUND_CLOSEST(48000U << 12, runtime->rate);
 	outw(val, TRID_REG(trident, T4D_SBDELTA_DELTA_R));
 
 	// Set channel interrupt blk length