staging: r8188eu: mark PS_RDY_CHECK as bool

Mark PS_RDY_CHECK as bool as it returns true/false.
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Vihas Makwana <makvihas@gmail.com>
Link: https://lore.kernel.org/r/20220302204737.49056-5-makvihas@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_pwrctrl.c

@@ -151,7 +151,7 @@ static void pwr_state_check_handler(struct timer_list *t)
 	rtw_ps_cmd(padapter);
 }
 
-static u8 PS_RDY_CHECK(struct adapter *padapter)
+static bool PS_RDY_CHECK(struct adapter *padapter)
 {
 	u32 curr_time, delta_time;
 	struct pwrctrl_priv	*pwrpriv = &padapter->pwrctrlpriv;