staging: rtl8723bs: hal: fix Using comparison to false is error prone

fix below issue reported by checkpatch

CHECK: Using comparison to false is error prone
Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c

@@ -175,7 +175,7 @@ static void rtl8723bs_c2h_packet_handler(struct adapter *padapter,
 
 	res = rtw_c2h_packet_wk_cmd(padapter, tmp, length);
 
-	if (res == false)
+	if (!res)
 		kfree(tmp);
 
 	/* DBG_871X("-%s res(%d)\n", __func__, res); */