staging: rtl8723bs: fix empty-body warning

staging: rtl8723bs: fix empty-body warning

The newly added driver causes lots of warnings like

drivers/staging/rtl8723bs/core/rtw_recv.c: In function 'validate_recv_frame':
drivers/staging/rtl8723bs/core/rtw_recv.c:1602:4: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]
    DBG_COUNTER(adapter->rx_logs.core_rx_pre_data_handled);
drivers/staging/rtl8723bs/core/rtw_xmit.c: In function 'update_attrib':
drivers/staging/rtl8723bs/core/rtw_xmit.c:726:3: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]
   DBG_COUNTER(padapter->tx_logs.core_tx_upd_attrib_unknown);
drivers/staging/rtl8723bs/hal/HalPhyRf.c: In function 'ODM_TXPowerTrackingCallback_ThermalMeter':
drivers/staging/rtl8723bs/hal/HalPhyRf.c:146:4: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
drivers/staging/rtl8723bs/hal/HalPhyRf.c:529:6: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
drivers/staging/rtl8723bs/hal/HalPhyRf.c:559:6: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]

When DBG_COUNTER() etc is defined as a non-empty macro, we get the intended
behavior and no warning. Using no_printk() for printing helper functions
as the added advantage of compile-time checking format strings

Fixes: 554c0a3abf21 ("staging: Add rtl8723bs sdio wifi driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>