staging: r8188eu: Remove wrapper rtw_get_time_interval_ms()

This one is never used.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Link: https://lore.kernel.org/r/20210805192644.15978-5-Larry.Finger@lwfinger.netSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/osdep_service.h

@@ -228,7 +228,6 @@ void _rtw_init_queue(struct __queue *pqueue);
 u32  rtw_systime_to_ms(u32 systime);
 u32  rtw_ms_to_systime(u32 ms);
 s32  rtw_get_passing_time_ms(u32 start);
-s32  rtw_get_time_interval_ms(u32 start, u32 end);
 
 void rtw_sleep_schedulable(int ms);
 

drivers/staging/r8188eu/os_dep/osdep_service.c

@@ -116,11 +116,6 @@ inline s32 rtw_get_passing_time_ms(u32 start)
 	return rtw_systime_to_ms(jiffies-start);
 }
 
-inline s32 rtw_get_time_interval_ms(u32 start, u32 end)
-{
-	return rtw_systime_to_ms(end-start);
-}
-
 void rtw_sleep_schedulable(int ms)
 {
 	u32 delta;