staging: rtl8723bs: use ARRAY_SIZE

Using the ARRAY_SIZE macro improves the readability of the code. Also,
it is not always useful to use a variable to store this constant
calculated at compile time.

Found with Coccinelle with the following semantic patch:
@r depends on (org || report)@
type T;
T[] E;
position p;
@@
(
 (sizeof(E)@p /sizeof(*E))
|
 (sizeof(E)@p /sizeof(E[...]))
|
 (sizeof(E)@p /sizeof(T))
)

Signed-off-by: Jérémy Lefaure <jeremy.lefaure@lse.epita.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/staging/rtl8723bs/core/rtw_rf.c b/drivers/staging/rtl8723bs/core/rtw_rf.c
index b87ea4e388c0..07f5577cc073 100644
--- a/drivers/staging/rtl8723bs/core/rtw_rf.c
+++ b/drivers/staging/rtl8723bs/core/rtw_rf.c
@@ -15,6 +15,7 @@
 #define _RTW_RF_C_
 
 #include <drv_types.h>
+#include <linux/kernel.h>
 
 
 struct ch_freq {
@@ -44,20 +45,18 @@ static struct ch_freq ch_freq_map[] = {
 	{216, 5080},/* Japan, means J16 */
 };
 
-static int ch_freq_map_num = (sizeof(ch_freq_map) / sizeof(struct ch_freq));
-
 u32 rtw_ch2freq(u32 channel)
 {
 	u8 i;
 	u32 freq = 0;
 
-	for (i = 0; i < ch_freq_map_num; i++) {
+	for (i = 0; i < ARRAY_SIZE(ch_freq_map); i++) {
 		if (channel == ch_freq_map[i].channel) {
 			freq = ch_freq_map[i].frequency;
 				break;
 		}
 	}
-	if (i == ch_freq_map_num)
+	if (i == ARRAY_SIZE(ch_freq_map))
 		freq = 2412;
 
 	return freq;