staging: r8188eu: remove rtw_usleep_os

Remove the rtw_usleep_os helper function. There are only two callers, both
of which call rtw_usleep_os(100). This is equivalent to msleep(1).

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Tested-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220626180603.287054-1-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_pwrctrl.c

@@ -273,7 +273,7 @@ static s32 LPS_RF_ON_check(struct adapter *padapter, u32 delay_ms)
 			err = -1;
 			break;
 		}
-		rtw_usleep_os(100);
+		msleep(1);
 	}
 
 	return err;

drivers/staging/r8188eu/hal/rtl8188e_hal_init.c

@@ -243,7 +243,7 @@ static int efuse_read_phymap_from_txpktbuf(
 			if (reg)
 				break;
 
-			rtw_usleep_os(100);
+			msleep(1);
 		} while (time_before(jiffies, timeout));
 
 		/* data from EEPROM needs to be in LE */

drivers/staging/r8188eu/include/osdep_service.h

@@ -76,8 +76,6 @@ void *rtw_malloc2d(int h, int w, int size);
 		spin_lock_init(&((q)->lock));			\
 	} while (0)
 
-void rtw_usleep_os(int us);
-
 static inline unsigned char _cancel_timer_ex(struct timer_list *ptimer)
 {
 	return del_timer_sync(ptimer);

drivers/staging/r8188eu/os_dep/osdep_service.c

@@ -42,14 +42,6 @@ Otherwise, there will be racing condition.
 Caller must check if the list is empty before calling rtw_list_delete
 */
 
-void rtw_usleep_os(int us)
-{
-	if (1 < (us / 1000))
-		msleep(1);
-	else
-		msleep((us / 1000) + 1);
-}
-
 static const struct device_type wlan_type = {
 	.name = "wlan",
 };