staging: rtl8723bs: remove unused RTW_DBGDUMP macro definition

remove unused RTW_DBGDUMP macro definition.
Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/5efe991636b899936f39a7efceaac9edce9da91e.1619254603.git.fabioaiuto83@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/include/rtw_debug.h

@@ -144,8 +144,6 @@
 
 #if defined(_dbgdump)
 
-#define RTW_DBGDUMP NULL /* 'stream' for _dbgdump */
-
 #endif /* defined(_dbgdump) */
 
 void mac_reg_dump(struct adapter *adapter);