[PATCH v2 2/5] staging: rtl8723bs: use standard offsetof in cfg80211 operations

[Navaneeth K <knavaneeth786@gmail.com>]

Replace usage of the custom FIELD_OFFSET macro with the standard
offsetof() macro in ioctl_cfg80211.c. This improves code readability
and uses the kernel's standard mechanism.

Also include <linux/stddef.h> in basic_types.h to ensure offsetof()
is available for this and future conversions.

Signed-off-by: Navaneeth K <knavaneeth786@gmail.com>
---
 drivers/staging/rtl8723bs/include/basic_types.h   | 1 +
 drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8723bs/include/basic_types.h b/drivers/staging/rtl8723bs/include/basic_types.h
index 1c2da18e6210..16b270fe0203 100644
--- a/drivers/staging/rtl8723bs/include/basic_types.h
+++ b/drivers/staging/rtl8723bs/include/basic_types.h
@@ -12,6 +12,7 @@
 #define FAIL	(-1)
 
 #include <linux/types.h>
+#include <linux/stddef.h>
 
 #define FIELD_OFFSET(s, field)	((__kernel_ssize_t)&((s *)(0))->field)
 
diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c b/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
index 315bab373729..60edeae1cffe 100644
--- a/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
+++ b/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
@@ -1712,7 +1712,8 @@ static int cfg80211_rtw_connect(struct wiphy *wiphy, struct net_device *ndev,
 
 		if (wep_key_len > 0) {
 			wep_key_len = wep_key_len <= 5 ? 5 : 13;
-			wep_total_len = wep_key_len + FIELD_OFFSET(struct ndis_802_11_wep, key_material);
+			wep_total_len = wep_key_len +
+				offsetof(struct ndis_802_11_wep, key_material);
 			pwep = rtw_malloc(wep_total_len);
 			if (!pwep) {
 				ret = -ENOMEM;
-- 
2.43.0