staging: r8188eu: remove unused ODM_FreeWorkItem()

Function ODM_FreeWorkItem() is unused and empty, remove it.
Acked-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210911132635.30369-10-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/hal/odm_interface.c

@@ -94,10 +94,6 @@ s32 ODM_CompareMemory(struct odm_dm_struct *pDM_Odm, void *pBuf1, void *pBuf2, u
 }
 
 /*  Work item relative API. FOr MP driver only~! */
-void ODM_FreeWorkItem(void *pRtWorkItem)
-{
-}
-
 void ODM_ScheduleWorkItem(void *pRtWorkItem)
 {
 }

drivers/staging/r8188eu/include/odm_interface.h

@@ -96,8 +96,6 @@ s32 ODM_CompareMemory(struct odm_dm_struct *pDM_Odm, void *pBuf1, void *pBuf2,
 		      u32 length);
 
 /*  ODM MISC-workitem relative API. */
-void ODM_FreeWorkItem(void *pRtWorkItem);
-
 void ODM_ScheduleWorkItem(void *pRtWorkItem);
 
 void ODM_IsWorkItemScheduled(void *pRtWorkItem);