staging: r8188eu: remove interrupt_handler member of hal_ops structure

interrupt_handler does not used.
Signed-off-by: Ivan Safonov <insafonov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/include/hal_intf.h

@@ -140,8 +140,6 @@ enum hal_intf_ps_func {
 };
 
 struct hal_ops {
-	s32	(*interrupt_handler)(struct adapter *padapter);
-
 	void (*hal_reset_security_engine)(struct adapter *adapter);
 };