md/raid10: remove dead code in reshape_request

A bio allocated by bio_alloc_bioset comes pre-zeroed, no need to
clear random fields.

Signed-off-by: Christoph Hellwig <[e-mail]>
Acked-by: Song Liu <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

drivers/md/raid10.c

···
 	read_bio->bi_private = r10_bio;
 	read_bio->bi_end_io = end_reshape_read;
 	bio_set_op_attrs(read_bio, REQ_OP_READ, 0);
-	read_bio->bi_flags &= (~0UL << BIO_RESET_BITS);
-	read_bio->bi_status = 0;
-	read_bio->bi_vcnt = 0;
-	read_bio->bi_iter.bi_size = 0;
 	r10_bio->master_bio = read_bio;
 	r10_bio->read_slot = r10_bio->devs[r10_bio->read_slot].devnum;