fix following post-commit checkpatch issue:

WARNING: Comparisons should place the constant on the right side of the test
1833: FILE: drivers/staging/rtl8723bs/os_dep/mlme_linux.c:151:
+               if (NULL == buff)

Signed-off-by: Fabio Aiuto <[email protected]>
---
 drivers/staging/rtl8723bs/os_dep/mlme_linux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8723bs/os_dep/mlme_linux.c 
b/drivers/staging/rtl8723bs/os_dep/mlme_linux.c
index f5c94509ad71..0a16752f805b 100644
--- a/drivers/staging/rtl8723bs/os_dep/mlme_linux.c
+++ b/drivers/staging/rtl8723bs/os_dep/mlme_linux.c
@@ -148,7 +148,7 @@ void rtw_report_sec_ie(struct adapter *adapter, u8 
authmode, u8 *sec_ie)
        buff = NULL;
        if (authmode == WLAN_EID_VENDOR_SPECIFIC) {
                buff = rtw_zmalloc(IW_CUSTOM_MAX);
-               if (NULL == buff)
+               if (!buff)
                        return;
 
                p = buff;
-- 
2.20.1

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