staging: rtl8723bs: remove unused BIT macros definitions

BIT(x) macro used all over the driver is defined in include/vsdo/bit.h as

- #define BIT(nr) (UL(1) << (nr))

which is safer than the local BIT macros declared. Local macros shift a signed integer which brings unespected results. For example:

(unsigned long)(1 << 31) => 0xffffffff80000000

shift.c:

int main() {
        printf("%lx\n", (unsigned long)(1 << 31));
        printf("%lx\n", (unsigned long)(1U << 31));
        return 0;
}

...

$ ./shift
ffffffff80000000
80000000

...

So just remove redundant, less safe macro declarations.

---
Changes in v2:
- Edited changelog

 drivers/staging/rtl8723bs/include/osdep_service.h | 4 ----
 drivers/staging/rtl8723bs/include/wifi.h          | 8 --------
 2 files changed, 12 deletions(-)

index b49838c7e457..bde415db4114 100644
@@ -14,10 +14,6 @@
 
 #include <osdep_service_linux.h>
 
-#ifndef BIT
-	#define BIT(x)	(1 << (x))
-#endif
-
 #define BIT0	0x00000001
 #define BIT1	0x00000002
 #define BIT2	0x00000004

index 0bd7b662b972..f03e26818d45 100644
@@ -7,14 +7,6 @@
 #ifndef _WIFI_H_
 #define _WIFI_H_
 
-
-#ifdef BIT
-/* error	"BIT define occurred earlier elsewhere!\n" */
-#undef BIT
-#endif
-#define BIT(x)	(1 << (x))
-
-
 #define WLAN_ETHHDR_LEN		14
 #define WLAN_ETHADDR_LEN	6
 #define WLAN_IEEE_OUI_LEN	3

2.20.1