ide-atapi: use local sense buffer

Access the sense buffer through the bio in ->pc_callback method thus
alleviating the need for the pc->buf pointer.

There should be no functional change resulting from this patch.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 060c893..14e5e9c 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -77,7 +77,8 @@
 	    (rq && blk_pc_request(rq)))
 		uptodate = 1; /* FIXME */
 	else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
-		u8 *buf = pc->buf;
+
+		u8 *buf = bio_data(rq->bio);
 
 		if (!pc->error) {
 			floppy->sense_key = buf[2] & 0x0F;