mtd: cfi_util: use DIV_ROUND_UP() in cfi_udelay()

Use DIV_ROUND_UP() in cfi_udelay() instead of open-coding it...

Doing this also helpfully gets rid of two complaints from
'scripts/checkpatch.pl --strict':

CHECK: spaces preferred around that '+' (ctx:VxV)
#29: FILE: drivers/mtd/chips/cfi_util.c:29:
+		msleep((us+999)/1000);
 		          ^

CHECK: spaces preferred around that '/' (ctx:VxV)
#29: FILE: drivers/mtd/chips/cfi_util.c:29:
+		msleep((us+999)/1000);
			       ^

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>

drivers/mtd/chips/cfi_util.c

@@ -26,7 +26,7 @@
 void cfi_udelay(int us)
 {
 	if (us >= 1000) {
-		msleep((us+999)/1000);
+		msleep(DIV_ROUND_UP(us, 1000));
 	} else {
 		udelay(us);
 		cond_resched();