[media] media: rc: Use bsearch library function

Replace self coded binary search, by existing library version.
Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/rc/rc-main.c

@@ -15,6 +15,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <media/rc-core.h>
+#include <linux/bsearch.h>
 #include <linux/spinlock.h>
 #include <linux/delay.h>
 #include <linux/input.h>
@@ -460,6 +461,18 @@ static int ir_setkeytable(struct rc_dev *dev,
 	return rc;
 }
 
+static int rc_map_cmp(const void *key, const void *elt)
+{
+	const unsigned int *scancode = key;
+	const struct rc_map_table *e = elt;
+
+	if (*scancode < e->scancode)
+		return -1;
+	else if (*scancode > e->scancode)
+		return 1;
+	return 0;
+}
+
 /**
  * ir_lookup_by_scancode() - locate mapping by scancode
  * @rc_map:	the struct rc_map to search
@@ -472,21 +485,14 @@ static int ir_setkeytable(struct rc_dev *dev,
 static unsigned int ir_lookup_by_scancode(const struct rc_map *rc_map,
 					  unsigned int scancode)
 {
-	int start = 0;
-	int end = rc_map->len - 1;
-	int mid;
-
-	while (start <= end) {
-		mid = (start + end) / 2;
-		if (rc_map->scan[mid].scancode < scancode)
-			start = mid + 1;
-		else if (rc_map->scan[mid].scancode > scancode)
-			end = mid - 1;
-		else
-			return mid;
-	}
+	struct rc_map_table *res;
 
-	return -1U;
+	res = bsearch(&scancode, rc_map->scan, rc_map->len,
+		      sizeof(struct rc_map_table), rc_map_cmp);
+	if (!res)
+		return -1U;
+	else
+		return res - rc_map->scan;
 }
 
 /**