[SCSI] st: remove unused frp_sg_current

frp_sg_current in struct st_buffer is always zero. We don't need it.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: NKai Makisara <Kai.Makisara@kolumbus.fi>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/st.c

@@ -1524,7 +1524,6 @@ static int setup_buffering(struct scsi_tape *STp, const char __user *buf,
 		else
 			STbp->do_dio = 0;  /* fall back to buffering with any error */
 		STbp->sg_segs = STbp->do_dio;
-		STbp->frp_sg_current = 0;
 		DEB(
 		     if (STbp->do_dio) {
 			STp->nbr_dio++;
@@ -3844,7 +3843,6 @@ static void normalize_buffer(struct st_buffer * STbuffer)
 		STbuffer->buffer_size -= (PAGE_SIZE << order);
 	}
 	STbuffer->frp_segs = 0;
-	STbuffer->frp_sg_current = 0;
 	STbuffer->sg_segs = 0;
 	STbuffer->map_data.page_order = 0;
 	STbuffer->map_data.offset = 0;

drivers/scsi/st.h

@@ -52,7 +52,6 @@ struct st_buffer {
 	unsigned short use_sg;	/* zero or max number of s/g segments for this adapter */
 	unsigned short sg_segs;		/* number of segments in s/g list */
 	unsigned short frp_segs;	/* number of buffer segments */
-	unsigned int frp_sg_current;	/* driver buffer length currently in s/g list */
 };
 
 /* The tape mode definition */