staging: r8188eu: remove rtw_hal_enable_interrupt function

Remove rtw_hal_enable_interrupt from hal/hal_intf.c, and remove its
declaration from include/hal_intf.h as well. This is just a wrapper
function that calls the function pointer enable_interrupt in struct
hal_ops if it is set, which it never is. In addition, this wrapper
function is unused anyway.
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210906010106.898-4-phil@philpotter.co.ukSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/hal/hal_intf.c

@@ -116,14 +116,6 @@ void rtw_hal_set_odm_var(struct adapter *adapt,
 						      val1, set);
 }
 
-void rtw_hal_enable_interrupt(struct adapter *adapt)
-{
-	if (adapt->HalFunc.enable_interrupt)
-		adapt->HalFunc.enable_interrupt(adapt);
-	else
-		DBG_88E("%s: HalFunc.enable_interrupt is NULL!\n", __func__);
-}
-
 void rtw_hal_disable_interrupt(struct adapter *adapt)
 {
 	if (adapt->HalFunc.disable_interrupt)

drivers/staging/r8188eu/include/hal_intf.h

@@ -284,7 +284,6 @@ void rtw_hal_set_odm_var(struct adapter *padapter,
 			 enum hal_odm_variable eVariable, void *pValue1,
 			 bool bSet);
 
-void rtw_hal_enable_interrupt(struct adapter *padapter);
 void rtw_hal_disable_interrupt(struct adapter *padapter);
 
 u32	rtw_hal_inirp_init(struct adapter *padapter);